Other Current and Non-Current Assets - Components of Other Current and Non-Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Asbestos-related current assets	$ 64.7	$ 66.0
Prepaid income tax	30.3	7.6
Other	52.4	48.4
Other current assets	147.4	122.0
Other employee benefit-related assets	111.3	96.5
Capitalized software costs	41.9	38.1
Environmental-related assets	24.5	33.4
Equity method investments	6.7	5.6
Other	18.5	14.8
Other non-current assets	$ 202.9	$ 188.4