Equity - Summary of Changes in the Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Foreign currency translation adjustment	$ 355.4	$ 21.1	$ 461.2	$ 670.5
Net change in fair value of derivatives, net of tax			(235.5)
Amounts reclassified to earnings of cash flow hedges, net of tax	7.3	5.2	11.0	5.1
Pension and post-retirement benefit plans, net of tax	0.0	0.0	(0.1)	0.0
Amortization of prior service (credits) costs, net of tax	(0.4)	(0.5)	(0.8)	(0.9)
Amortization of actuarial (gains) losses, net of tax	1.0	$ 0.0	1.2	$ 0.1
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(1,355.4)
Ending balances	(1,118.4)		(1,118.4)
Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			533.1
Net change in fair value of derivatives, net of tax			(235.5)
Amounts reclassified to earnings of cash flow hedges, net of tax			11.0
Ending balances	308.6		308.6
Defined Benefit Pension
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(32.8)
Pension and post-retirement benefit plans, net of tax			(0.1)
Amortization of prior service (credits) costs, net of tax			(0.8)
Amortization of actuarial (gains) losses, net of tax			1.2
Ending balances	(32.5)		(32.5)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances			(1,855.7)
Foreign currency translation adjustment			461.2
Ending balances	$ (1,394.5)		$ (1,394.5)