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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($)
Recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | $ 85.9 |  | $ 85.9 |  |  | $ 84.1
Foreign currency forward contracts |  |  |  |  |  | 0.1
Total assets | 85.9 |  | 85.9 |  |  | 84.2
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  | 0.5
Total liabilities | 0.1 |  | 0.1 |  |  | 0.5
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 85.9 |  | 85.9 |  |  | 84.1
Foreign currency forward contracts |  |  |  |  |  | 0.0
Total assets | 85.9 |  | 85.9 |  |  | 84.1
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total liabilities | 0.0 |  | 0.0 |  |  | 0.0
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
Total assets | 0.0 |  | 0.0 |  |  | 0.1
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  | 0.5
Total liabilities | 0.1 |  | 0.1 |  |  | 0.5
Recurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0
Foreign currency forward contracts |  |  |  |  |  | 0.0
Total assets | 0.0 |  | 0.0 |  |  | 0.0
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total liabilities | 0.0 |  | 0.0 |  |  | 0.0
Euro-denominated notes |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (1.5) |  | (1.5) |  |  | 14.1
Forward contracts | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation gain (loss) on net investment hedge | (4.2) |  | (4.2) |  |  | (4.1)
Forward contracts | Not designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Loss associated with forward contracts included in interest and other expenses | 0.1 | $ 0.9 | 1.4 |  |  |
Gain associated with forward contracts included in interest and other expenses |  |  |  | $ 0.9 |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 898.5 |  | 898.5 |  |  | 858.2
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 838.9 |  | 838.9 |  |  | $ 810.2
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 446.3 |  | 446.3 |  | € 400,000,000 |
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 392.6 |  | $ 392.6 |  | € 350,000,000.0 |

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