Supplemental Cash Flow Information - Supplemental Cash Flow Reconciliation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]
Interest expense	$ 708.3	$ 562.9	$ 1,954.1	$ 1,677.4
Adjustments to reconcile to cash paid for interest:
Net change in accrued interest			(204.8)	(144.0)
Executive compensation and benefit plans			(12.8)	(12.4)
Capitalized interest			38.6	21.0
Debt issuance costs and fees			(55.0)	0
Other			(0.5)	(6.7)
Amortization of deferred finance charges			(32.0)	(41.6)
Net amortization of discounts and premiums			(255.1)	(231.4)
Amortization of accumulated other comprehensive loss			0	(4.5)
Rollover of PIK interest to principal			(1.3)	(1.2)
Payments for (Proceeds from) Hedge, Financing Activities			121.1	100.6
Cash paid for interest			$ 1,552.3	$ 1,357.2