Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]
Derivative assets	$ 1,403.6		$ 1,204.2
Cross-currency and interest rate derivative contracts
Derivative [Line Items]
Valuation adjustment in asset cross currency and interest rate derivative contracts	8.8		9.8
Valuation adjustment in liability cross currency and interest rate derivative contracts	142.6		173.0
Gain (loss) on change in credit risk valuation included in realized and unrealized gains (losses) on derivative instruments, net	(29.5)	(32.5)
Derivative assets	959.9		769.2
Counterparty Credit Risk [Member]
Derivative [Line Items]
Derivative assets	$ 588.7
UPC Holding Cross-Currency Options [Member]
Derivative [Line Items]
Derivative exchange rate	0.7354