Goodwill and Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Total intangible assets, accumulated amortization	$ 136.8	$ 101.6
Total intangible assets, cost	1,683.3	1,687.3
Total intangible assets, net	1,546.5	1,585.7
Customer Relationships [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	1,195.6	1,196.4
Total intangible assets, accumulated amortization	113.6	91.0
Intangible assets subject to amortization, net	1,082.0	1,105.4
Product Technology and Patents [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets subject to amortization, cost	210.1	212.9
Total intangible assets, accumulated amortization	23.2	10.6
Intangible assets subject to amortization, net	186.9	202.3
Tradenames and Trademarks [Member]
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization, cost	261.6	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