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New Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2016 | Nov. 30, 2016 | May 31, 2016
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Decrease in income taxes | $ 2.4 | $ 19.6 |
Stock based compensation expense | 1.3 | 3.0 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 | Additional Paid-in Capital |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Cumulative effect adjustment | (26.7) | (26.7) |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09 | Retained Earnings |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Cumulative effect adjustment | $ 26.7 | $ 26.7 |
Other Assets | Accounting Standards Update 2015-03 |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Debt issuance costs |  |  | $ 5.6
Long Term Liabilities | Accounting Standards Update 2015-03 |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |
Debt issuance costs |  |  | $ (5.6)

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