Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Cash Flow, Supplemental [Line Items]
Cash paid for interest, net	$ 143.4	$ 76.9	$ 67.5
Cash paid for income taxes, net	$ 145.1	$ 182.8	$ 134.2