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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | $ 304.2 |  | $ 247.3 | $ 246.0 |  | $ 242.3
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 | 56.1 |  | 44.6 |  |  |
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 asset | 0.0 |  | 0.0 |  |  |
Total assets at fair value | 56.1 |  | 44.6 |  |  |
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] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure | 0.0 |  | 0.0 |  |  |
Foreign currency forward contracts receivable | 7.4 |  | 6.5 |  |  |
Loans Receivable, Fair Value Disclosure | 825.2 |  | 331.2 |  |  |
Deferred compensation plan assets | 326.5 |  | 258.2 |  |  |
Mortgage banking derivative asset | 0.0 |  | 0.0 |  |  |
Total assets at fair value | 1,159.1 |  | 595.9 |  |  |
Foreign currency forward contracts payable | 9.7 |  | 8.6 |  |  |
Deferred compensation plan liabilities | 315.9 |  | 251.8 |  |  |
Business Combination, Contingent Consideration, Liability | 0.0 |  | 0.0 |  |  |
Mortgage banking derivative liabilities | 0.0 |  | 0.0 |  |  |
Total liabilities at fair value | 325.6 |  | 260.4 |  |  |
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 | 27.0 | $ (1.3) | 6.3 | 18.7 | $ 8.1 | 8.7
Investments, Fair Value Disclosure | 26.5 | 20.0 | 11.5 |  |  |
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 asset | 58.5 |  | 32.4 |  |  |
Total assets at fair value | 85.0 |  | 43.9 |  |  |
Foreign currency forward contracts payable | 0.0 |  | 0.0 |  |  |
Deferred compensation plan liabilities | 0.0 |  | 0.0 |  |  |
Business Combination, Contingent Consideration, Liability | 173.8 | $ 180.3 | 192.0 | $ 163.3 | $ 179.6 | $ 227.1
Mortgage banking derivative liabilities | 53.8 |  | 26.1 |  |  |
Total liabilities at fair value | $ 227.6 |  | $ 218.1 |  |  |

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