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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 EUR (€) | Dec. 31, 2016 USD ($)
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | $ (13.9) |  | $ (13.9) |  |  | $ 24.8
Fair value measured on a recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 94.4 |  | 94.4 |  |  | 86.8
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  |
Total assets measured at fair value | 94.5 |  | 94.5 |  |  | 86.8
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  | 0.2
Total liabilities measured at fair value | 0.1 |  | 0.1 |  |  | 0.2
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 94.4 |  | 94.4 |  |  | 86.8
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  |
Total assets measured at fair value | 94.4 |  | 94.4 |  |  | 86.8
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total liabilities measured at fair value | 0.0 |  | 0.0 |  |  | 0.0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  |
Total assets measured at fair value | 0.1 |  | 0.1 |  |  | 0.0
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  | 0.2
Total liabilities measured at fair value | 0.1 |  | 0.1 |  |  | 0.2
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  |
Total assets measured at fair value | 0.0 |  | 0.0 |  |  | 0.0
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total liabilities measured at fair value | 0.0 |  | 0.0 |  |  | 0.0
Euro-denominated notes |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (9.7) |  | (9.7) |  |  | 29.0
Forward contracts | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (4.2) |  | (4.2) |  |  | (4.2)
Forward contracts | Not designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Loss associated with forward contracts included in interest and other expenses | 0.0 | $ 0.7 |  | $ 1.3 |  |
Gain associated with forward contracts included in interest and other expenses |  |  | 0.1 |  |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 899.5 |  | 899.5 |  |  | 831.6
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 853.8 |  | 853.8 |  |  | $ 785.2
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 399.5 |  | 399.5 |  | € 350,000,000.0 |
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 454.3 |  | $ 454.3 |  | € 400,000,000 |

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