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Derivative Financial Instruments and Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 EUR (€) | Dec. 31, 2014 USD ($)
Net investment hedges [Abstract] |  |  |  |  |  |
Translation loss on net investment hedge | $ 4.2 |  | $ 4.2 |  |  | $ 24.5
Recurring basis |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 80.9 |  | 80.9 |  |  | 81.4
Foreign currency forward contracts | 0.1 |  | 0.1 |  |  | 0.1
Total assets | 81.0 |  | 81.0 |  |  | 81.5
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.7 |  | 0.7 |  |  |
Total liabilities | 0.7 |  | 0.7 |  |  |
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Assets |  |  |  |  |  |
Deferred compensation plan assets | 80.9 |  | 80.9 |  |  | 81.4
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  | 0.0
Total assets | 80.9 |  | 80.9 |  |  | 81.4
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.0 |  | 0.0 |  |  |
Total liabilities | 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 |  | 0.1 |  |  | 0.1
Total assets | 0.1 |  | 0.1 |  |  | 0.1
Liabilities |  |  |  |  |  |
Foreign currency forward contracts | 0.7 |  | 0.7 |  |  |
Total liabilities | 0.7 |  | 0.7 |  |  |
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 |  |  |
Total liabilities | 0.0 |  | 0.0 |  |  |
Euro-denominated notes |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation loss on net investment hedge | 0.0 |  | 0.0 |  |  | 24.5
Forward contracts | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Translation loss on net investment hedge | 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 | 0.9 | $ 0.1 |  |  |  |
Gain associated with forward contracts included in interest and other expenses |  |  | 0.9 | $ 0.1 |  |
Fair value | Euro-denominated notes | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 876.7 |  | 876.7 |  |  | 471.6
Carrying value | Euro-denominated notes |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Carrying value of long-term debt | 833.6 |  | 833.6 |  |  | $ 422.1
Notes due June 2018 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | 390.1 |  | 390.1 |  | € 350,000,000.0 |
Notes due September 2022 | Euro-denominated notes | Designated as hedging instrument |  |  |  |  |  |
Net investment hedges [Abstract] |  |  |  |  |  |
Long-term debt | $ 443.5 |  | $ 443.5 |  | € 400,000,000 |

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