Schedule II - Valuation and Qualifying Accounts - Disclosure Table (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		$ 10.0	$ 9.0	$ 13.7
Additions charged to costs and expenses		1.1	2.3
Reductions credited				(1.2)
Deductions	[1]	0.9	2.2	3.9
Other changes	[2]	2.4	0.9	0.4
Ending balance		$ 12.6	$ 10.0	$ 9.0

[1] Uncollectible accounts written off, net of recoveries

[2] Result of foreign currency effects