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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 EUR (€) | Dec. 31, 2016 USD ($)
Net investment hedges [Abstract] |  |  |  |
Translation gain (loss) on net investment hedge | $ 19.1 |  |  | $ 24.8
Fair value measured on a recurring basis |  |  |  |
Assets |  |  |  |
Deferred compensation plan assets | 91.5 |  |  | 86.8
Foreign currency forward contracts | 0.1 |  |  |
Total assets measured at fair value | 91.6 |  |  | 86.8
Liabilities |  |  |  |
Foreign currency forward contracts |  |  |  | 0.2
Total liabilities measured at fair value |  |  |  | 0.2
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Assets |  |  |  |
Deferred compensation plan assets | 91.5 |  |  | 86.8
Foreign currency forward contracts | 0.0 |  |  |
Total assets measured at fair value | 91.5 |  |  | 86.8
Liabilities |  |  |  |
Foreign currency forward contracts |  |  |  | 0.0
Total liabilities measured at fair value |  |  |  | 0.0
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) |  |  |  |
Assets |  |  |  |
Deferred compensation plan assets | 0.0 |  |  | 0.0
Foreign currency forward contracts | 0.1 |  |  |
Total assets measured at fair value | 0.1 |  |  | 0.0
Liabilities |  |  |  |
Foreign currency forward contracts |  |  |  | 0.2
Total liabilities measured at fair value |  |  |  | 0.2
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets |  |  |  |
Deferred compensation plan assets | 0.0 |  |  | 0.0
Foreign currency forward contracts | 0.0 |  |  |
Total assets measured at fair value | 0.0 |  |  | 0.0
Liabilities |  |  |  |
Foreign currency forward contracts |  |  |  | 0.0
Total liabilities measured at fair value |  |  |  | 0.0
Euro-denominated notes |  |  |  |
Net investment hedges [Abstract] |  |  |  |
Translation gain (loss) on net investment hedge | 23.3 |  |  | 29.0
Forward contracts | Designated as hedging instrument |  |  |  |
Net investment hedges [Abstract] |  |  |  |
Translation gain (loss) on net investment hedge | (4.2) |  |  | (4.2)
Forward contracts | Not designated as hedging instrument |  |  |  |
Net investment hedges [Abstract] |  |  |  |
Gain associated with forward contracts included in interest and other expenses | 0.1 |  |  |
Loss associated with forward contracts included in interest and other expenses |  | $ 0.6 |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |
Liabilities |  |  |  |
Carrying value of long-term debt | 840.9 |  |  | 831.6
Carrying value | Euro-denominated notes |  |  |  |
Liabilities |  |  |  |
Carrying value of long-term debt | 795.6 |  |  | $ 785.2
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |
Net investment hedges [Abstract] |  |  |  |
Long-term debt | 372.4 |  | € 350,000,000.0 |
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |
Net investment hedges [Abstract] |  |  |  |
Long-term debt | $ 423.2 |  | € 400,000,000 |

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