Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	$ 2,367.9
Valuation allowance	4.3	$ 6.9	$ (8.4)	$ (15.2)
Unrecognized Tax Benefits	203.4	220.3	$ 195.6	$ 156.6
Uncertain tax positions if recognized would impact the effective tax rate	148.8
Interest accrued on UTPs	27.9	20.8
UTPs
Income Tax Contingency [Line Items]
Net interest expense	$ 7.2	$ 5.5