Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Currently payable
Federal	$ (0.1)	$ 0.0	$ 0.5
International	125.6	117.7	136.8
Total current taxes	125.5	117.7	137.3
Deferred
Federal	(0.4)	1.2	(0.7)
International	(15.7)	(3.5)	(22.3)
Total deferred taxes	(16.1)	(2.3)	(23.0)
Total provision (benefit) for income taxes	$ 109.4	$ 115.4	$ 114.3