Accumulated Other Comprehensive Income - Changes in Components of Other Comprehensive Income, Net of Tax (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	$ 38.1
Accumulated Other Comprehensive Income, Ending Balance	(253.1)
Foreign Currency Translation [Member]
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	111.8
OCI before reclassifications	(276.6)
Accumulated Other Comprehensive Income, Ending Balance	(164.8)
Unrealized Gains on Securities [Member]
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	(0.4)
OCI before reclassifications	0.5
Accumulated Other Comprehensive Income, Ending Balance	0.1
Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	(143.4)
OCI before reclassifications	4.7
Reclassifications	6.5
Accumulated Other Comprehensive Income, Ending Balance	(132.2)
Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income, Beginning Balance	70.1
OCI before reclassifications	43.4
Reclassifications	(69.7)
Accumulated Other Comprehensive Income, Ending Balance	$ 43.8