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Debt - Euro Notes (Details) | Sep. 11, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Uncommitted credit lines, maximum borrowing capacity | $ |  | $ 292,900,000 |
Revolving credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Uncommitted credit lines, maximum borrowing capacity | $ |  | $ 600,000,000.0 |
Senior notes | Notes due September 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | € 400,000,000 |  |
Interest rate (as a percent) | 1.875% |  |
Net proceeds from the notes | € 397,400,000 |  |
Discounted issue price (as a percent) | 99.753% |  |
Effective interest rate (as a percent) | 1.913% |  |
Senior notes | Notes due June 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  |  | € 350,000,000.0
Interest rate (as a percent) |  | 4.50% | 4.50%
Discounted issue price (as a percent) |  | 99.974% | 99.974%
Effective interest rate (as a percent) |  | 4.505% | 4.505%

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