Schedule II - Valuation and Qualifying Accounts - Disclosure Table (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		$ 19.0	$ 12.1	$ 16.6
Additions charged to costs and expenses		1.2	10.1	0.9
Deductions	[1]	4.1	2.4	4.0
Other changes	[2]	0.3	(0.8)	(1.4)
Ending balance		$ 16.4	$ 19.0	$ 12.1

[1] Uncollectible accounts written off, net of recoveries

[2] Result of foreign currency effects