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Derivative Financial Instruments and Fair Value Measurements (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | $ (19,800,000) |  | $ (19,800,000) |  |  | $ (39,900,000)
Fair value measured on a recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 99,300,000 |  | 99,300,000 |  |  | 99,100,000
Foreign currency forward contracts | 200,000 |  | 200,000 |  |  |
Total assets measured at fair value | 99,500,000 |  | 99,500,000 |  |  | 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 | 99,300,000 |  | 99,300,000 |  |  | 99,100,000
Foreign currency forward contracts | 0 |  | 0 |  |  |
Total assets measured at fair value | 99,300,000 |  | 99,300,000 |  |  | 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 | 200,000 |  | 200,000 |  |  |
Total assets measured at fair value | 200,000 |  | 200,000 |  |  | 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 | (15,600,000) |  | (15,600,000) |  |  | (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 associated with forward contracts included in interest and other expenses | 2,100,000 | $ 0 | 2,100,000 | $ 100,000 |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 1,086,200,000 |  | 1,086,200,000 |  |  | 939,900,000
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 1,044,400,000 |  | 1,044,400,000 |  |  | $ 897,800,000
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 465,200,000 |  | 465,200,000 |  | € 400,000,000 |
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 579,200,000 |  | $ 579,200,000 |  | € 500,000,000 |

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