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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | May 31, 2017 | May 31, 2016
Income Tax Contingency [Line Items] |  |  |
Reserve for uncertain tax positions |  | $ 39.2 | $ 54.2
Decreased reserve for uncertain tax positions | $ 28.9 |  |
Impact of uncertain tax positions, if recognized, on effective income tax rate |  | $ 39.2 | $ 54.2
IRS [Member] | Earliest Tax Year [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Fiscal year currently under audit |  | 2012 |
Fiscal years subject to potential audit |  | 2015 |
IRS [Member] | Latest Tax Year [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Fiscal year currently under audit |  | 2014 |
Fiscal years subject to potential audit |  | 2017 |

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