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Derivative Financial Instruments and Fair Value Measurements (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Fair value measured on a recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | $ 101,600,000 |  | $ 101,600,000 |  |  | $ 99,100,000
Foreign currency forward contracts | 100,000 |  | 100,000 |  |  |
Total assets measured at fair value | 101,700,000 |  | 101,700,000 |  |  | 99,100,000
Liabilities |  |  |  |  |  |
Foreign currency forward contracts |  |  |  |  |  | 100,000
Total liabilities measured at fair value |  |  |  |  |  | 100,000
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 101,600,000 |  | 101,600,000 |  |  | 99,100,000
Foreign currency forward contracts | 0 |  | 0 |  |  |
Total assets measured at fair value | 101,600,000 |  | 101,600,000 |  |  | 99,100,000
Liabilities |  |  |  |  |  |
Foreign currency forward contracts |  |  |  |  |  | 0
Total liabilities measured at fair value |  |  |  |  |  | 0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 0 |  | 0 |  |  | 0
Foreign currency forward contracts | 100,000 |  | 100,000 |  |  |
Total assets measured at fair value | 100,000 |  | 100,000 |  |  | 0
Liabilities |  |  |  |  |  |
Foreign currency forward contracts |  |  |  |  |  | 100,000
Total liabilities measured at fair value |  |  |  |  |  | 100,000
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 0 |  | 0 |  |  | 0
Foreign currency forward contracts | 0 |  | 0 |  |  |
Total assets measured at fair value | 0 |  | 0 |  |  | 0
Liabilities |  |  |  |  |  |
Foreign currency forward contracts |  |  |  |  |  | 0
Total liabilities measured at fair value |  |  |  |  |  | 0
Euro-denominated notes |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (10,000,000) |  | (10,000,000) |  |  | (35,700,000)
Forward contracts | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (4,200,000) |  | (4,200,000) |  |  | (4,200,000)
Forward contracts | Not designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Gain (loss) on derivative | 0 | $ 0 |  | $ 0 |  |
Gain associated with forward contracts included in interest and other expenses |  |  | 2,000,000 |  |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 1,070,000,000 |  | 1,070,000,000 |  |  | 939,900,000
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 1,036,600,000 |  | 1,036,600,000 |  |  | $ 897,800,000
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 462,100,000 |  | 462,100,000 |  | € 400,000,000 |
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 574,500,000 |  | $ 574,500,000 |  | € 500,000,000 |

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