Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details)

v3.10.0.1
Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
May 31, 2018
[1]
Goodwill and Intangible Assets, Net of Accumulated Amortization [Abstract]          
Goodwill $ 810.6   $ 810.6   $ 814.0
Amortization expense $ 6.6 $ 5.3 $ 13.1 $ 9.2  
[1] Amounts have been adjusted to reflect the adoption of ASC Topic 606.