Fair Value Measurements (Summary of Assets and Liabilities at Fair Value) (Schedule) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	May 22, 2017	Dec. 31, 2016
Assets:
Derivative instruments	$ 2,317.8		$ 3,176.1
Investments, fair value	2,160.8		2,057.2
Total assets	4,478.6		5,233.3
Liabilities:
Derivative instruments	1,588.0		1,309.9
Debt	795.9		344.4
Total liabilities	2,383.9		1,654.3
Quoted prices in active markets for identical assets (Level 1)
Assets:
Derivative instruments	0.0		0.0
Investments, fair value	1,751.7		1,682.4
Total assets	1,751.7		1,682.4
Liabilities:
Derivative instruments	0.0		0.0
Debt	394.0		215.5
Total liabilities	394.0		215.5
Significant other observable inputs (Level 2)
Assets:
Derivative instruments	1,750.6		2,652.1
Investments, fair value	0.0		0.0
Total assets	1,750.6		2,652.1
Liabilities:
Derivative instruments	1,565.2		1,290.6
Debt	401.9		128.9
Total liabilities	1,967.1		1,419.5
Significant unobservable inputs (Level 3)
Assets:
Derivative instruments	567.2		524.0
Investments, fair value	409.1		374.8
Total assets	976.3		898.8
Liabilities:
Derivative instruments	22.8		19.3
Debt	0.0		0.0
Total liabilities	22.8		19.3
Cross-Currency and Interest Rate Derivative Contracts [Member]
Assets:
Derivative instruments	1,730.6		2,606.5
Liabilities:
Derivative instruments	1,554.3		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	1,730.6		2,606.5
Liabilities:
Derivative instruments	1,542.2		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	12.1		10.7
Equity-Related Derivative Instruments [Member]
Assets:
Derivative instruments	567.2	$ 51.0	524.0
Liabilities:
Derivative instruments	10.7		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	567.2		524.0
Liabilities:
Derivative instruments	10.7		8.6
Foreign Currency Forwards and Option Contracts [Member]
Assets:
Derivative instruments	19.3		45.1
Liabilities:
Derivative instruments	23.0		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	19.3		45.1
Liabilities:
Derivative instruments	23.0		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	0.7		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	0.7		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
C&W [Member] | Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	9.00%
C&W [Member] | Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	12.00%
LiLAC Group Puerto Rico [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	8.00%
LiLAC Group Puerto Rico [Member] | Franchise Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	9.00%
LiLAC Group C&W [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate	10.00%