Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	$ 804.0	$ 522.4
SMAs	2,332.6	2,801.3
Other investments	2,152.2	2,226.1
Total investments	4,484.8	5,027.4
Total assets	5,288.8	5,549.8
Derivative instruments:	601.2	892.0
Total liabilities	601.2	892.0
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	575.6	672.1
Other investments	546.5	747.9
Total investments	1,122.1	1,420.0
Total assets	1,122.1	1,420.0
Total liabilities	0.0	0.0
Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	689.9	389.2
SMAs	1,757.0	2,124.2
Other investments	67.9	70.8
Total investments	1,824.9	2,195.0
Total assets	2,514.8	2,584.2
Total liabilities	601.2	859.3
Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	114.1	133.2
SMAs	0.0	5.0
Other investments	1,537.8	1,407.4
Total investments	1,537.8	1,412.4
Total assets	1,651.9	1,545.6
Total liabilities	0.0	32.7
Cross-currency and interest rate derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	637.8	379.2
Derivative instruments:	593.7	879.0
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:	637.8	379.2
Derivative instruments:	593.7	846.3
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	32.7
Equity-related derivative instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	114.1	113.8
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:	114.1	113.8
Foreign currency forward and option contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	51.5	28.4
Derivative instruments:	7.5	13.0
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:	51.5	9.0
Derivative instruments:	7.5	13.0
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	19.4
Derivative instruments:	0.0	0.0
Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	0.6	1.0
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
Other \| Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	0.6	1.0
Other \| Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative instruments:	$ 0.0	$ 0.0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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