Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	$ 1,827.5	$ 2,496.7
Investments	1,289.2	1,174.8
Total assets	3,116.7	3,671.5
Liabilities - derivative instruments	1,582.7	1,370.7
Debt	45.6	248.6
Total liabilities	1,628.3	1,619.3
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.0
Investments	869.2	755.9
Total assets	869.2	755.9
Liabilities - derivative instruments	0.0	0.0
Debt	0.0	0.0
Total liabilities	0.0	0.0
Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	1,164.1	1,750.1
Investments	0.0	0.0
Total assets	1,164.1	1,750.1
Liabilities - derivative instruments	1,562.8	1,354.9
Debt	45.6	248.6
Total liabilities	1,608.4	1,603.5
Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	663.4	746.6
Investments	420.0	418.9
Total assets	1,083.4	1,165.5
Liabilities - derivative instruments	19.9	15.8
Debt	0.0	0.0
Total liabilities	19.9	15.8
Cross-currency and interest rate derivative contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	1,157.2	1,742.8
Liabilities - derivative instruments	1,581.5	1,368.7
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]
Assets - derivative instruments	0.0	0.0
Liabilities - 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]
Assets - derivative instruments	1,157.2	1,742.5
Liabilities - derivative instruments	1,561.6	1,354.3
Cross-currency and interest rate derivative contracts \| Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.3
Liabilities - derivative instruments	19.9	14.4
Total equity-related derivative instruments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	663.4	746.3
Liabilities - derivative instruments	0.0	1.4
Total equity-related derivative instruments \| Quoted prices in active markets for identical assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.0
Liabilities - derivative instruments		0.0
Total equity-related derivative instruments \| Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.0
Liabilities - derivative instruments		0.0
Foreign currency forward and option contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	6.0	7.2
Liabilities - derivative instruments	1.2	0.5
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]
Assets - derivative instruments	0.0	0.0
Liabilities - 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]
Assets - derivative instruments	6.0
Liabilities - derivative instruments	1.2
Foreign currency forward and option contracts \| Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.0
Liabilities - derivative instruments	0.0	0.0
Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.9	0.4
Liabilities - derivative instruments	0.0	0.1
Other \| Quoted prices in active markets for identical assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.0	0.0
Liabilities - derivative instruments		0.0
Other \| Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	0.9
Other \| Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets - derivative instruments	$ 0.0	0.0
Liabilities - derivative instruments		$ 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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