Other Current and Non-Current Assets - Components of Other Current and Non-Current Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Asbestos-related current assets	$ 102.4	$ 84.5
Current deferred income taxes	56.2	59.5
Prepaid Taxes	25.9	23.6
Short-term investments	5.4	112.9
Other	59.9	65.1
Other current assets	249.8	345.6
Other employee benefit-related assets	93.0	95.5
Capitalized software costs	26.8	14.6
Environmental related assets	7.7	11.7
Equity method investments	3.9	4.7
Other	18.4	18.4
Other non-current assets	$ 149.8	$ 144.9