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Acquisition - Schedule of Intangible Assets Acquired (Detail) - A&S Business [Member] - USD ($)
$ in Millions
Mar. 31, 2019
Oct. 01, 2018
Intangible assets acquired consist of:    
Customer relationships   $ 1,025.0
Trade names and trademarks   209.0
Technology   204.0
In-process research and development ("IPR&D")   16.0
Total intangible assets $ 1,454.0 $ 1,454.0