Derivative Instruments - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 CAD	May. 31, 2015 USD ($) Interest_Rate_Swaps	Nov. 30, 2014 USD ($) Interest_Rate_Swaps	Dec. 31, 2012 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			$ 9,230,000,000
Net cash provided by (used for) investing activities			$ (61,500,000)	$ (7,790,800,000)	$ 43,000,000
Number of forward starting interest rate swaps | Contract			3
Settlement of derivatives			$ (14,200,000)	388,900,000
Foreign currency derivatives, premium				59,900,000
Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			170,000,000
Fixed Income Interest Rate [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			115,000,000
Variable Income Interest Rate [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			200,000,000
Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of pre-tax losses in AOCI expect to be reclassified into interest expense			(12,700,000)
2014 Term Loan Facility [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount on 2014 term loan facility for interest payments			$ 5,140,400,000
Forward-Starting Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date	Mar. 31, 2021		Mar. 31, 2021
Foreign currency forward contract notional amount	$ 6,750,000,000		$ 6,690,400,000					$ 2,500,000,000	$ 6,733,100,000	$ 2,300,000,000
Number of sequential interest rate swap | Interest_Rate_Swaps								6	6
Amount on 2014 term loan facility for interest payments								$ 2,500,000,000
Derivative, type of interest rate paid on swap			Fixed
Net cash provided by (used for) investing activities			$ 36,200,000
Forward-Starting Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			$ 5,690,400,000
Forward-Starting Interest Rate Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date			Mar. 31, 2021
Foreign currency forward contract notional amount			$ 1,000,000,000
Forward-Starting Interest Rate Swaps [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net unrealized loss remaining in AOCI			$ 84,600,000
Forward-Starting Interest Rate Swaps [Member] | Floating Rate Debt Beginning 2015 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount										1,000,000,000
Forward-Starting Interest Rate Swaps [Member] | Floating Rate Debt Beginning 2016 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount										$ 1,300,000,000
Forward-Starting Interest Rate Swaps [Member] | 2014 Term Loan Facility [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date			Apr. 01, 2015
Settlement of derivative notional amount		$ (42,700,000)
Mandatory prepayment		$ 42,700,000
Foreign Exchange Option [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives, outstanding			$ 9,000,000,000				CAD 9,971,800,000
Foreign currency derivatives, premium			59,900,000
Cross-currency Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency derivatives, outstanding			$ 5,230,000,000				5,635,300,000
Cross Currency Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date			Sep. 28, 2017
Foreign currency forward contract notional amount			$ 315,000,000
Foreign currency forward contract - net unrealized gains			31,800,000
Settlement of derivatives			$ 52,100,000
Cross Currency Interest Rate Contract [Member] | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding cross currency rate swaps			3.948%
Cross Currency Interest Rate Contract [Member] | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding cross currency rate swaps			6.525%
Cross Currency Interest Rate Contract [Member] | Fixed Income Interest Rate [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount			$ 1,200,000,000			€ 1,107,800,000
Cross Currency Interest Rate Contract [Member] | Canadian Dollar [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract notional amount | CAD							CAD 5,641,700,000
Cross Currency Interest Rate Contract [Member] | Canadian Dollar [Member] | Minimum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding cross currency rate swaps			4.802%
Cross Currency Interest Rate Contract [Member] | Canadian Dollar [Member] | Maximum [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding cross currency rate swaps			7.002%
Cross Currency Interest Rate Contract [Member] | United States Dollar [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date			Mar. 31, 2021
Foreign currency forward contract notional amount			$ 5,000,000,000
Interest Rate Caps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cross-currency rate swaps, maturity date			Oct. 19, 2016
Forward interest swaps maturity period			6 years
Interest Rate Caps [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign currency forward contract - net unrealized gains				$ (1,000,000)