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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 EUR (€) | Dec. 31, 2015 USD ($)
Recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | $ 87.2 |  | $ 87.2 |  |  | $ 84.1
Foreign currency forward contracts | 0.2 |  | 0.2 |  |  | 0.1
Total assets | 87.4 |  | 87.4 |  |  | 84.2
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.8 |  | 0.8 |  |  | 0.5
Total liabilities | 0.8 |  | 0.8 |  |  | 0.5
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 87.2 |  | 87.2 |  |  | 84.1
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total assets | 87.2 |  | 87.2 |  |  | 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 | 0.2 |  | 0.2 |  |  | 0.1
Total assets | 0.2 |  | 0.2 |  |  | 0.1
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.8 |  | 0.8 |  |  | 0.5
Total liabilities | 0.8 |  | 0.8 |  |  | 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 |  | 0.0 |  |  | 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 | 4.0 |  | 4.0 |  |  | 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 | 0.7 |  | 1.3 |  |  |
Gain associated with forward contracts included in interest and other expenses |  | $ 1.6 |  | $ 1.8 |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 887.7 |  | 887.7 |  |  | 858.2
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 828.9 |  | 828.9 |  |  | $ 810.2
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 387.9 |  | 387.9 |  | € 350,000,000.0 |
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 441.0 |  | $ 441.0 |  | € 400,000,000 |

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