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Derivative Financial Instruments (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 EUR (€) | Jun. 22, 2018 EUR (€)
Euro-denominated notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Unrealized translation loss on net investment hedge included in accumulated other comprehensive loss, net of taxes | $ 500,000 | $ 35,700,000 |  |  |
Designated as economic hedges | Forward contracts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Unrealized translation loss on net investment hedge included in accumulated other comprehensive loss, net of taxes | 4,200,000 | 4,200,000 |  |  |
Not designated as hedges | Forward contracts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Loss associated with forward contracts included in interest and other expenses |  |  | $ 1,600,000 |  |
Gain associated with forward contracts included in interest and other expenses | 2,200,000 | $ 0 |  |  |
€400 due September 2022 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Principal amount | € |  |  |  | € 400,000,000 |
€400 due September 2022 | Designated as economic hedges | Euro-denominated notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Principal amount | 456,800,000 |  |  | 400,000,000 |
€500 due June 2026 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Principal amount | € |  |  |  | € 500,000,000 |
Senior notes | €500 due June 2026 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Principal amount | $ 567,800,000 |  |  |  | € 500,000,000

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