Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	May 22, 2017	Dec. 31, 2016
Assets:
Derivative instruments	$ 2,581.1		$ 3,176.1
Investments, fair value	2,070.2		2,057.2
Total assets	4,651.3		5,233.3
Liabilities:
Derivative instruments	1,442.2		1,309.9
Debt	757.3		344.4
Total liabilities	2,199.5		1,654.3
Quoted prices in active markets for identical assets (Level 1)
Assets:
Derivative instruments	0.0		0.0
Investments, fair value	1,670.8		1,682.4
Total assets	1,670.8		1,682.4
Liabilities:
Derivative instruments	0.0		0.0
Debt	356.8		215.5
Total liabilities	356.8		215.5
Significant other observable inputs (Level 2)
Assets:
Derivative instruments	2,024.5		2,652.1
Investments, fair value	0.0		0.0
Total assets	2,024.5		2,652.1
Liabilities:
Derivative instruments	1,418.4		1,290.6
Debt	400.5		128.9
Total liabilities	1,818.9		1,419.5
Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	556.6		524.0
Investments, fair value	399.4		374.8
Total assets	956.0		898.8
Liabilities:
Derivative instruments	23.8		19.3
Debt	0.0		0.0
Total liabilities	23.8		19.3
Cross-Currency and Interest Rate Derivative Contracts [Member]
Assets:
Derivative instruments	1,999.5		2,606.5
Liabilities:
Derivative instruments	1,414.2		1,292.2
Cross-Currency and Interest Rate Derivative Contracts [Member] | Quoted prices in active markets for identical assets (Level 1)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments	0.0		0.0
Cross-Currency and Interest Rate Derivative Contracts [Member] | Significant other observable inputs (Level 2)
Assets:
Derivative instruments	1,999.5		2,606.5
Liabilities:
Derivative instruments	1,399.2		1,281.5
Cross-Currency and Interest Rate Derivative Contracts [Member] | Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments	15.0		10.7
Equity-Related Derivative Instruments [Member]
Assets:
Derivative instruments	556.6	$ 51.0	524.0
Liabilities:
Derivative instruments	8.8		8.6
Equity-Related Derivative Instruments [Member] | Quoted prices in active markets for identical assets (Level 1)
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)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments	0.0		0.0
Equity-Related Derivative Instruments [Member] | Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	556.6		524.0
Liabilities:
Derivative instruments	8.8		8.6
Foreign Currency Forwards and Option Contracts [Member]
Assets:
Derivative instruments	24.1		45.1
Liabilities:
Derivative instruments	19.2		9.0
Foreign Currency Forwards and Option Contracts [Member] | Quoted prices in active markets for identical assets (Level 1)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments	0.0		0.0
Foreign Currency Forwards and Option Contracts [Member] | Significant other observable inputs (Level 2)
Assets:
Derivative instruments	24.1		45.1
Liabilities:
Derivative instruments	19.2		9.0
Foreign Currency Forwards and Option Contracts [Member] | Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments	0.0		0.0
Other Contract [Member]
Assets:
Derivative instruments	0.9		0.5
Liabilities:
Derivative instruments			0.1
Other Contract [Member] | Quoted prices in active markets for identical assets (Level 1)
Assets:
Derivative instruments	0.0		0.0
Liabilities:
Derivative instruments			0.0
Other Contract [Member] | Significant other observable inputs (Level 2)
Assets:
Derivative instruments	0.9		0.5
Liabilities:
Derivative instruments			0.1
Other Contract [Member] | Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	$ 0.0		0.0
Liabilities:
Derivative instruments			$ 0.0
CWC [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average discount rate	9.00%
CWC [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average discount rate	12.00%