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Fair Value Measurements (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Document Period End Date | Jun. 30, 2020 |  |  |
Derivative, Notional Amount | $ 2,000.0 | $ 2,300.0 |  |
Fair value of long-term debt | 645.4 | 685.9 |  |
Long-term debt, net of debt issuance costs | 665.4 | 664.6 |  |
Investments, Fair Value Disclosure | 304.1 | 328.6 | $ 272.8 | $ 247.3
Foreign currency forward contracts, net notional value | 980.0 | 1,050.0 |  |
Deferred compensation plan, contra-equity, shares held in trust | 5.7 | 5.7 |  |
Foreign Exchange Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 3.6 | 10.6 |  |
Derivative Asset, Fair Value, Gross Liability | 0.7 | 0.1 |  |
Derivative Liability, Fair Value, Gross Asset | 0.6 | 0.8 |  |
Derivative Liability, Fair Value, Gross Liability | 5.5 | 5.2 |  |
Long-Term Senior Notes [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | 2.8 | 3.1 |  |
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 187.8 | 224.8 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, Fair Value Disclosure | 0.0 | 0.0 |  |
Foreign currency forward contract, current asset amount | 3.0 | 10.5 |  |
Foreign currency forward contract, current liability amount | 5.0 | 4.4 |  |
Deferred compensation plan assets | 372.4 | 349.9 |  |
Deferred compensation plan liabilities | $ 351.1 | $ 346.1 |  |

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