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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Assets |  |  |  |
Investments, Fair Value Disclosure | $ 740.8 | $ 794.9 | $ 639.6 | $ 340.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets |  |  |  |
Investments, Fair Value Disclosure | 51.7 | 58.3 |  |
Foreign currency forward contracts receivable | 0.0 | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 | 0.0 |  |
Deferred compensation plan assets | 0.0 | 0.0 |  |
Mortgage Banking Derivative Assets | 0.0 | 0.0 |  |
Total assets at fair value | 51.7 | 58.3 |  |
Liabilities |  |  |  |
Foreign currency forward contracts payable | 0.0 | 0.0 |  |
Deferred compensation plan liabilities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 | 0.0 |  |
Total liabilities at fair value | 0.0 | 0.0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets |  |  |  |
Investments, Fair Value Disclosure | 0.0 | 0.0 |  |
Foreign currency forward contracts receivable | 12.5 | 3.7 |  |
Loans Receivable, Fair Value Disclosure | 677.4 | 463.2 |  |
Deferred compensation plan assets | 604.3 | 517.9 |  |
Mortgage Banking Derivative Assets | 0.0 | 0.0 |  |
Total assets at fair value | 1,294.2 | 984.8 |  |
Liabilities |  |  |  |
Foreign currency forward contracts payable | 8.8 | 4.8 |  |
Deferred compensation plan liabilities | 576.1 | 485.4 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 | 0.0 |  |
Total liabilities at fair value | 584.9 | 490.2 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets |  |  |  |
Investments, Fair Value Disclosure | 367.3 | 452.0 | 303.5 |
Foreign currency forward contracts receivable | 0.0 | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 | 0.0 |  |
Deferred compensation plan assets | 0.0 | 0.0 |  |
Mortgage Banking Derivative Assets | 128.0 | 190.2 |  |
Total assets at fair value | 495.3 | 642.2 |  |
Liabilities |  |  |  |
Foreign currency forward contracts payable | 0.0 | 0.0 |  |
Deferred compensation plan liabilities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 57.5 | 73.2 | $ 84.1 |
Mortgage banking derivative liabilities | 117.7 | 169.5 |  |
Total liabilities at fair value | $ 175.2 | $ 242.7 |  |

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