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Summary of Significant Accounting Policies - Summary of Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 554.9	$ 568.2
Accumulated Amortization	(169.2)	(124.1)
Net Carrying Value	$ 385.7	$ 444.1
Weighted Average Useful Life (years)	11 years 6 months	11 years 6 months
Gross Carrying Value	$ 565.7
Accumulated Amortization	(169.2)	$ (124.1)
Net Carrying Value	396.5
In-process research and development
Indefinite-lived Intangible Assets [Line Items]
Gross and Net Carrying Value	10.8
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	20.1	22.2
Accumulated Amortization	(11.8)	(9.3)
Net Carrying Value	$ 8.3	$ 12.9
Weighted Average Useful Life (years)	8 years 6 months	8 years 7 months 6 days
Accumulated Amortization	$ (11.8)	$ (9.3)
Customer-based
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	533.4	544.6
Accumulated Amortization	(156.3)	(113.9)
Net Carrying Value	$ 377.1	$ 430.7
Weighted Average Useful Life (years)	11 years 7 months 6 days	11 years 7 months 6 days
Accumulated Amortization	$ (156.3)	$ (113.9)
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.4	1.4
Accumulated Amortization	(1.1)	(0.9)
Net Carrying Value	$ 0.3	$ 0.5
Weighted Average Useful Life (years)	2 years 6 months	5 years 2 months 12 days
Accumulated Amortization	$ (1.1)	$ (0.9)

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