Supplemental Cash Flow Information - Supplemental Cash Flow Reconciliation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Cash Flow Information [Abstract]
Interest expense	$ 592.3	$ 574.7
Adjustments to reconcile to cash paid for interest:
Net change in accrued interest	(116.6)	(160.4)
Amortization of deferred finance charges	(9.6)	(16.0)
Net amortization of discounts and premiums	(81.0)	(70.7)
Amortization of accumulated other comprehensive loss	0	(4.2)
Rollover of PIK interest to principal	(0.6)	(0.6)
Payments for (Proceeds from) Hedge, Financing Activities	(35.1)	(21.0)
Cash paid for interest	$ 419.6	$ 343.8