Income Taxes (Reconciliation of Gross Unrecognized Tax Benefits, Not Including Interest or Other Potential Offsetting Effects) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2017 |
May 31, 2016 |
May 31, 2015 |
|
| Income Taxes [Abstract] | |||
| Balance as of beginning of fiscal year | $ 64.7 | $ 39.9 | $ 40.0 |
| Additions for tax positions of the current year | 8.2 | 7.3 | 6.7 |
| Additions for tax positions of prior years | 4.8 | 20.7 | 0.8 |
| Reductions for tax positions of prior years | (2.5) | (0.1) | (0.4) |
| Settlements with tax authorities | (29.5) | (2.2) | (1.2) |
| Expiration of the statute of limitations | (2.0) | (0.9) | (6.0) |
| Balance as of end of fiscal year | $ 43.7 | $ 64.7 | $ 39.9 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|