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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Fair value of long-term debt | $ 357.8 |  | $ 360.9 |  |  |
Long-term debt, net of debt issuance costs | 369.5 |  | 372.8 |  |  |
Derivative, Notional Amount | 1,730.0 |  | 1,810.0 |  |  |
Foreign currency forward contracts, net notional value | 1,190.0 |  | 1,020.0 |  |  |
Investments, Fair Value Disclosure | 792.8 |  | 794.9 | $ 786.7 |  | $ 639.6
Deferred compensation plan, contra-equity, shares held in trust | 11.4 |  | 9.8 |  |  |
Foreign Exchange Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 3.4 |  | 7.7 |  |  |
Derivative Asset, Fair Value, Gross Liability | (0.1) |  | (4.0) |  |  |
Derivative Liability, Fair Value, Gross Asset | (1.4) |  | (1.6) |  |  |
Derivative Liability, Fair Value, Gross Liability | 9.7 |  | 6.4 |  |  |
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 | 307.8 |  | 284.6 |  |  |
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 | 3.3 |  | 3.7 |  |  |
Foreign currency forward contract, current liability amount | 8.3 |  | 4.8 |  |  |
Deferred compensation plan assets | 590.3 |  | 517.9 |  |  |
Deferred compensation plan liabilities | 540.4 |  | 485.4 |  |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | 438.7 | $ 438.1 | 452.0 | $ 453.5 | $ 460.4 | $ 303.5
Foreign currency forward contract, current asset amount | 0.0 |  | 0.0 |  |  |
Foreign currency forward contract, current liability amount | 0.0 |  | 0.0 |  |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  |
Deferred compensation plan liabilities | $ 0.0 |  | $ 0.0 |  |  |

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