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Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments $ 1,287.5 $ 1,256.9
SMAs 2,029.5 2,276.1
Other investments 3,195.2 3,122.9
Total investments 5,224.7 5,399.0
Total assets 6,512.2 6,655.9
Derivative instruments 901.9 1,379.8
Total liabilities 901.9 1,379.8
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 407.0 483.7
Other investments 1,623.2 1,559.7
Total investments 2,030.2 2,043.4
Total assets 2,030.2 2,043.4
Total liabilities 0.0 0.0
Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments 983.0 946.2
SMAs 1,622.5 1,792.4
Other investments 0.1 0.1
Total investments 1,622.6 1,792.5
Total assets 2,605.6 2,738.7
Total liabilities 811.2 1,332.4
Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments 304.5 310.7
SMAs 0.0 0.0
Other investments 1,571.9 1,563.1
Total investments 1,571.9 1,563.1
Total assets 1,876.4 1,873.8
Total liabilities 90.7 47.4
Cross-currency and interest rate derivative contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments 972.0 943.1
Derivative instruments 802.2 1,318.4
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 972.0 943.1
Derivative instruments 802.2 1,318.4
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 304.5 310.7
Derivative instruments 90.7 47.4
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
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
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 304.5 310.7
Derivative instruments 90.7 47.4
Foreign currency forward and option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments 10.8 2.9
Derivative instruments 9.0 14.0
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 10.8 2.9
Derivative instruments 9.0 14.0
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 0.2
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
Other | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments 0.2 0.2
Other | Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative instruments $ 0.0 $ 0.0