Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments and on Interest Rate Swaps Designated as Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Interest Income (Expense), Net [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	$ 1.6	$ 2.7	$ 5.8	$ 8.8
Derivatives Not Designated as Accounting Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	79.1	(0.7)	125.1	(5.9)
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Forward [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	9.2	$ (0.7)	14.0	$ (5.9)
Bureau van Dijk (BvD) [Member] | Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Forward [Member] | Purchase price hedge [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	10.3		10.3
Bureau van Dijk (BvD) [Member] | Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Collar [Member] | Purchase price hedge [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	$ 59.6		$ 100.8