Goodwill and Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Total intangible assets, accumulated amortization	$ 118.7	$ 101.6
Total intangible assets, cost	1,678.6	1,687.3
Total intangible assets, net	1,559.9	1,585.7
Customer Relationships [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	1,191.9	1,196.4
Total intangible assets, accumulated amortization	101.0	91.0
Intangible assets subject to amortization, net	1,090.9	1,105.4
Product Technology and Patents [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	210.0	212.9
Total intangible assets, accumulated amortization	17.7	10.6
Intangible assets subject to amortization, net	192.3	202.3
Tradenames and Trademarks [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	260.7	262.0
In-process Research and Development [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	$ 16.0	$ 16.0