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Debt (Senior Notes Due 2022) (Details) - Senior Notes [Member] | Jun. 30, 2018 | Jun. 03, 2015 EUR (€) | Jan. 02, 2014 USD ($)
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Senior Notes 5.375% Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | $ |  |  | $ 500,000,000
Stated interest rate | 5.375% |  | 5.375%
Senior Notes 4.75% Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Face amount of debt instrument | € |  | € 515,000,000.0 |
Stated interest rate | 4.75% | 4.75% |

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