Annual report pursuant to Section 13 and 15(d)

Business Combinations (Narrative) (Details)

v3.19.2
Business Combinations (Narrative) (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 20, 2018
USD ($)
Feb. 28, 2018
USD ($)
Aug. 18, 2017
USD ($)
state
May 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Nov. 30, 2018
USD ($)
Aug. 31, 2018
USD ($)
May 31, 2018
USD ($)
Feb. 28, 2018
USD ($)
Nov. 30, 2017
USD ($)
 [1]
Aug. 31, 2017
USD ($)
 [1]
May 31, 2019
USD ($)
May 31, 2018
USD ($)
May 31, 2017
USD ($)
Business Acquisition [Line Items]                            
Restricted cash       $ 57.1               $ 57.1    
Revenues       980.4 $ 1,070.4 $ 858.9 $ 862.8 $ 845.7 [1] $ 936.1 [1] $ 803.0 $ 792.9 3,772.5 $ 3,377.7 [1],[2] $ 3,153.0 [2]
Net income       230.4 $ 324.6 $ 235.8 $ 243.6 217.7 [1] 367.2 [1] $ 198.8 $ 210.4 1,034.4 994.1 [1],[2],[3] 826.3 [2],[3],[4]
Goodwill       $ 1,782.6       $ 814.0 [5]       $ 1,782.6 814.0 [5] $ 657.1
Oasis Outsourcing Group Holdings, L.P. [Member]                            
Business Acquisition [Line Items]                            
Effective acquisition date                       Dec. 20, 2018    
Purchase price $ 992.2                          
Restricted cash 132.1                          
Credit facility portion of purchase price 800.0                          
Cash acquired 262.3                          
Revenues                       $ 163.7    
Net income                       5.1    
Incurred acquisition and integration costs                       5.3    
Intangible assets 310.9                          
Goodwill $ 972.1                          
Excluded incurred costs related to acquisition                       2.7    
Excluded incurred costs related to acquisition, net of tax                       $ 2.0    
Included incurred costs related to acquisition                         2.7  
Included incurred costs related to acquisition, net of tax                         $ 1.7  
Oasis Outsourcing Group Holdings, L.P. [Member] | Weighted Average [Member]                            
Business Acquisition [Line Items]                            
Amortization period 10 years                          
Lessor Group [Member]                            
Business Acquisition [Line Items]                            
Effective acquisition date                       Feb. 28, 2018    
Purchase price   $ 162.5                        
Cash acquired   13.4                        
Goodwill   $ 112.3             $ 112.3          
HR Outsourcing Holdings, Inc. [Member]                            
Business Acquisition [Line Items]                            
Effective acquisition date                       Aug. 18, 2017    
Purchase price     $ 75.4                      
Cash portion of purchase price     42.2                      
Common stock issued portion of purchase price     33.2                      
Goodwill     $ 51.1                      
HR Outsourcing Holdings, Inc. [Member] | Minimum [Member]                            
Business Acquisition [Line Items]                            
Number of states | state     35                      
[1] Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[2] Amounts have been adjusted to reflect the adoption of Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" ("ASC Topic 606").
[3] Amounts have been adjusted to reflect the adoption of Accounting Standards Update ("ASU") No. 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force)."
[4] Amounts have been adjusted to reflect the adoption of ASC Topic 606.
[5] Amounts have been adjusted to reflect the adoption of ASC Topic 606 and to provide further detail related to certain professional employer organization ("PEO") balances.