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Supplemental Cash Flow Information - Supplemental Cash Flow Reconciliation (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Supplemental Cash Flow Information [Abstract]        
Interest expense $ 653.7 $ 540.0 $ 1,245.9 $ 1,114.7
Adjustments to reconcile to cash paid for interest:        
Net change in accrued interest     9.7 (51.1)
Executive compensation and benefit plans     (3.9) (9.3)
Capitalized interest     29.3 6.9
Debt issuance costs and fees     (26.1) 0
Other     0.1 (5.7)
Amortization of deferred finance charges     (19.3) (28.2)
Net amortization of discounts and premiums     (164.1) (141.8)
Amortization of accumulated other comprehensive loss     0 (4.3)
Rollover of PIK interest to principal     (0.6) (0.6)
Payments for (Proceeds from) Hedge, Financing Activities     79.2 66.5
Cash paid for interest     $ 1,150.2 $ 947.1