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Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: $ 1,761.4 $ 1,204.2
Investments 1,662.7 3,481.8
Total assets 3,424.1 4,686.0
Liabilities - derivative instruments: 2,560.8 3,056.5
Total liabilities 2,560.8 3,056.5
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 1,344.3 3,182.4
Total assets 1,344.3 3,182.4
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: 1,361.2 773.8
Investments 0.0 0.0
Total assets 1,361.2 773.8
Total liabilities 2,472.4 2,939.6
Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 400.2 430.4
Investments 318.4 299.4
Total assets 718.6 729.8
Total liabilities 88.4 116.9
Cross Currency Interest Rate Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 1,357.3 769.2
Liabilities - derivative instruments: 2,471.3 2,918.6
Cross Currency Interest Rate Contract [Member] | 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 Interest Rate Contract [Member] | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 1,357.3 769.2
Liabilities - derivative instruments: 2,471.3 2,918.6
Cross Currency Interest Rate Contract [Member] | 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
Equity-related derivative instruments [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 400.2 430.4
Liabilities - derivative instruments: 88.4 116.9
Equity-related derivative instruments [Member] | 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
Equity-related derivative instruments [Member] | 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 0.0
Equity-related derivative instruments [Member] | Significant unobservable inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 400.2 430.4
Liabilities - derivative instruments: 88.4 116.9
Foreign Exchange Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 2.5 2.6
Liabilities - derivative instruments: 0.8 20.2
Foreign Exchange Contract [Member] | 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 Exchange Contract [Member] | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 2.5 2.6
Liabilities - derivative instruments: 0.8 20.2
Foreign Exchange Contract [Member] | 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 Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 1.4 2.0
Liabilities - derivative instruments: 0.3 0.8
Other Contract [Member] | 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
Other Contract [Member] | Significant other observable inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets - derivative instruments: 1.4 2.0
Liabilities - derivative instruments: 0.3 0.8
Other Contract [Member] | 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