Fair Value Measurements - Additional Information (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
Interest expense	$ 708.3	$ 562.9	$ 1,954.1	$ 1,677.4
Impairment of intangible and tangible assets	498.6	818.6	548.8	945.9
Fair Value, Measurements, Nonrecurring [Member]
Impairment of intangible and tangible assets			524.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability			31.5
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure	1,135.8		1,135.8
Business Combination, Contingent Consideration, Liability	67.3		67.3
Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest expense				3.9
Interest Rate Swap [Member]
Derivative, Number of Instruments Held	8		8
Derivative, Notional Amount	$ 5,750.0		$ 5,750.0