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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets |  |  |  |
Investments, Fair Value Disclosure | $ 639.6 | $ 340.3 | $ 328.6 | $ 247.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets |  |  |  |
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 |  |
Investments, Fair Value Disclosure | 84.5 | 77.2 |  |
Mortgage Banking Derivative Assets | 0.0 | 0.0 |  |
Total assets at fair value | 84.5 | 77.2 |  |
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 |  |  |  |
Foreign currency forward contracts receivable | 15.9 | 13.1 |  |
Loans Receivable, Fair Value Disclosure | 822.3 | 1,529.2 |  |
Deferred compensation plan assets | 528.8 | 446.3 |  |
Investments, Fair Value Disclosure | 0.0 | 0.0 |  |
Mortgage Banking Derivative Assets | 0.0 | 0.0 |  |
Total assets at fair value | 1,367.0 | 1,988.6 |  |
Liabilities |  |  |  |
Foreign currency forward contracts payable | 0.8 | 3.4 |  |
Deferred compensation plan liabilities | 513.0 | 427.6 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Mortgage Banking Derivative Liabilities | 0.0 | 0.0 |  |
Total liabilities at fair value | 513.8 | 431.0 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |
Assets |  |  |  |
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 |  |
Investments, Fair Value Disclosure | 182.3 | 59.3 | 34.4 |
Mortgage Banking Derivative Assets | 60.4 | 87.1 |  |
Total assets at fair value | 242.7 | 146.4 |  |
Liabilities |  |  |  |
Foreign currency forward contracts payable | 0.0 | 0.0 |  |
Deferred compensation plan liabilities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 84.1 | 85.7 | $ 148.5 |
Mortgage Banking Derivative Liabilities | 38.5 | 73.4 |  |
Total liabilities at fair value | $ 122.6 | $ 159.1 |  |

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