Other Current and Non-Current Assets - Components of Other Current and Non-Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Asbestos-related current assets	$ 66.0	$ 74.5
Prepaid Taxes	7.6	14.3
Short-term investments	0.0	64.9
Other	48.4	50.7
Other current assets	122.0	204.4
Other employee benefit-related assets	96.5	92.9
Capitalized software costs	38.1	28.2
Environmental related assets	33.4	10.8
Equity method investments	5.6	5.6
Other	14.8	15.8
Other non-current assets	$ 188.4	$ 153.3