Derivative Instruments - Summary of Fair Value Measurements (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivatives assets designated as cash flow hedges	$ 0.2	$ 720.7
Derivatives liabilities designated as cash flow hedges	312.2	56.2
Derivatives designated as cash flow hedges | Foreign Currency | Prepaid expenses and other current assets
Derivative [Line Items]
Derivatives assets designated as cash flow hedges	0.2	2.8
Derivatives designated as cash flow hedges | Foreign Currency | Other accrued liabilities
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges	66.8	55.1
Derivatives designated as cash flow hedges | Forward currency contracts | Other accrued liabilities
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges	4.3	1.1
Derivatives designated as net investment hedges | Foreign Currency | Derivative assets
Derivative [Line Items]
Derivatives assets designated as cash flow hedges	0.0	717.9
Derivatives designated as net investment hedges | Forward currency contracts | Other liabilities, net
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges	$ 241.1	$ 0.0