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Debt - Euro Notes (Details) | Jun. 22, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Net proceeds | € 495,700,000 |  |  |
Revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit lines, maximum borrowing capacity | $ |  | $ 600,000,000.0 |  |
€500 due June 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | € 500,000,000 |
Notes due June 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  |  | € 350,000,000
Notes due September 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  |  | 400,000,000 |
Euro-denominated notes | Designated as economic hedges | Notes due September 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | 456,800,000 | € 400,000,000 |
Senior notes | €500 due June 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | € 500,000,000 | $ 567,800,000 |  |
Interest rate (as a percent) | 1.75% |  |  |
Discounted issue price (as a percent) | 99.564% |  |  |
Effective interest rate (as a percent) | 1.809% |  |  |
Senior notes | Notes due June 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount | € 350,000,000 |  |  |
Senior notes | Notes due September 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) |  | 1.875% | 1.875% |

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