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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | $ 786.1 | $ 505.0 | $ 786.1 | $ 505.0 |  | $ 639.6 |  | $ 340.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | 58.7 |  | 58.7 |  |  | 84.5 |  |
Foreign currency forward contracts receivable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative asset | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total assets at fair value | 58.7 |  | 58.7 |  |  | 84.5 |  |
Foreign currency forward contracts payable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total liabilities at fair value | 0.0 |  | 0.0 |  |  | 0.0 |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Foreign currency forward contracts receivable | 7.8 |  | 7.8 |  |  | 15.9 |  |
Loans Receivable, Fair Value Disclosure | 634.8 |  | 634.8 |  |  | 822.3 |  |
Deferred compensation plan assets | 528.1 |  | 528.1 |  |  | 528.8 |  |
Mortgage banking derivative asset | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total assets at fair value | 1,170.7 |  | 1,170.7 |  |  | 1,367.0 |  |
Foreign currency forward contracts payable | 1.2 |  | 1.2 |  |  | 0.8 |  |
Deferred compensation plan liabilities | 484.9 |  | 484.9 |  |  | 513.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Total liabilities at fair value | 486.1 |  | 486.1 |  |  | 513.8 |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net | 21.6 | 12.6 | 21.6 | 12.6 | $ 37.1 | 21.9 | $ 32.9 | 13.7
Investments, Fair Value Disclosure | 460.4 | 181.6 | 460.4 | 181.6 | 344.2 | 303.5 | 140.1 | 59.3
Foreign currency forward contracts receivable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Loans Receivable, Fair Value Disclosure | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan assets | 0.0 |  | 0.0 |  |  | 0.0 |  |
Mortgage banking derivative asset | 128.8 |  | 128.8 |  |  | 60.4 |  |
Total assets at fair value | 589.2 |  | 589.2 |  |  | 363.9 |  |
Foreign currency forward contracts payable | 0.0 |  | 0.0 |  |  | 0.0 |  |
Deferred compensation plan liabilities | 0.0 |  | 0.0 |  |  | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 74.9 | 18.0 | 74.9 | 18.0 | $ 79.5 | 84.1 | $ 68.2 | $ 85.7
Mortgage banking derivative liabilities | 107.2 |  | 107.2 |  |  | 38.5 |  |
Total liabilities at fair value | 182.1 |  | 182.1 |  |  | $ 122.6 |  |
Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 45.3 | 6.3 | 62.5 | 38.1 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 71.1 | 37.1 | 94.6 | 86.2 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (0.2) |  | (0.2) | (0.1) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | 1.9 |  | (1.9) |  |  |  |
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 2.2 | (7.6) | 22.6 | 11.3 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 48.4 | 29.6 | 86.0 | 70.7 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (66.1) | (42.3) | (108.9) | (83.1) |  |  |  |
Earn-out Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 1.0 | 1.1 | 0.3 | 1.0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (0.3) | 0.0 | (0.4) | (0.3) |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0.0 | 0.0 | 2.0 | 3.8 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | $ (5.3) | $ (51.3) | $ (11.1) | $ (72.2) |  |  |  |

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