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Derivatives - Schedule of Pretax Effects of Derivative Financial Instruments Designated or Previously Designated as Effective Hedges (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	$ 22.4	$ (38.9)	$ (69.8)
Gain/(Loss) Reclassified from AOCL to Income	(42.7)	(8.3)	(12.0)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)			(88.1)
Gain/(Loss) Reclassified from AOCL to Income	(26.6)	(8.2)	(6.2)
Foreign Currency Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	24.1	(33.1)	31.3
Gain/(Loss) Reclassified from AOCL to Income	(13.0)	6.8	7.4
Cross-currency Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in OCI (effective portion)	(1.7)	(5.8)	(13.0)
Gain/(Loss) Reclassified from AOCL to Income	$ (3.1)	$ (6.9)	$ (13.2)

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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-SubTopic 10
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