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Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | $ 572.5 | $ 884.8
SMAs | 1,961.2 | 1,965.9
Other investments | 1,667.8 | 1,500.1
Total investments | 3,629.0 | 3,466.0
Total assets | 4,201.5 | 4,350.8
Derivative instruments: | 828.7 | 1,616.8
Total liabilities | 828.7 | 1,616.8
Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
SMAs | 426.0 | 405.7
Other investments | 961.6 | 888.2
Total investments | 1,387.6 | 1,293.9
Total assets | 1,387.6 | 1,293.9
Total liabilities | 0.0 | 0.0
Significant other observable inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 432.1 | 603.9
SMAs | 1,535.2 | 1,560.2
Other investments | 87.5 | 92.3
Total investments | 1,622.7 | 1,652.5
Total assets | 2,054.8 | 2,256.4
Total liabilities | 828.7 | 1,616.8
Significant unobservable inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 140.4 | 280.9
SMAs | 0.0 | 0.0
Other investments | 618.7 | 519.6
Total investments | 618.7 | 519.6
Total assets | 759.1 | 800.5
Total liabilities | 0.0 | 0.0
Cross-currency and interest rate derivative contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 425.2 | 567.2
Derivative instruments: | 773.8 | 1,535.3
Cross-currency and interest rate derivative contracts | Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Derivative instruments: | 0.0 | 0.0
Cross-currency and interest rate derivative contracts | Significant other observable inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 425.2 | 567.2
Derivative instruments: | 773.8 | 1,535.3
Cross-currency and interest rate derivative contracts | Significant unobservable inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Derivative instruments: | 0.0 | 0.0
Equity-related derivative instruments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 140.4 | 280.9
Equity-related derivative instruments | Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Equity-related derivative instruments | Significant other observable inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Equity-related derivative instruments | Significant unobservable inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 140.4 | 280.9
Foreign currency forward and option contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 6.7 | 36.6
Derivative instruments: | 54.8 | 81.5
Foreign currency forward and option contracts | Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Derivative instruments: | 0.0 | 0.0
Foreign currency forward and option contracts | Significant other observable inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 6.7 | 36.6
Derivative instruments: | 54.8 | 81.5
Foreign currency forward and option contracts | Significant unobservable inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Derivative instruments: | 0.0 | 0.0
Other |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.2 | 0.1
Derivative instruments: | 0.1 | 0.0
Other | Quoted prices in active markets for identical assets (Level 1) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | 0.0
Derivative instruments: | 0.0 |
Other | Significant other observable inputs (Level 2) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.2 | 0.1
Derivative instruments: | 0.1 |
Other | Significant unobservable inputs (Level 3) |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative instruments: | 0.0 | $ 0.0
Derivative instruments: | $ 0.0 |

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