Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	$ 403.1	$ 236.0
Accumulated Amortization, intangible assets subject to amortization	(184.4)	(154.2)
Net Carrying Amount, intangible assets subject to amortization	218.7	81.8
Gross Carrying Amount, total intangible assets	403.1	236.6
Net Carrying Amount, total intangible assets	218.7	82.4
Amortization expense related to intangible assets subject to amortization	28.9	29.6	$ 21.7
In-process research and development
Intangible assets
Gross Carrying Amount, intangible assets not subject to amortization		0.6
Net Carrying Amount, intangible assets not subject to amortization		0.6
Impairment charge on definite-lived intangible assets	0.6
Existing technology and related patents
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	272.6	195.4
Accumulated Amortization, intangible assets subject to amortization	(160.5)	(138.9)
Net Carrying Amount, intangible assets subject to amortization	112.1	56.5
Customer relationships
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	112.0	34.6
Accumulated Amortization, intangible assets subject to amortization	(18.1)	(12.9)
Net Carrying Amount, intangible assets subject to amortization	93.9	21.7
Non compete contracts
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	1.8	1.8
Accumulated Amortization, intangible assets subject to amortization	(1.8)	(1.5)
Net Carrying Amount, intangible assets subject to amortization		0.3
Trade names
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	11.6	4.2
Accumulated Amortization, intangible assets subject to amortization	(1.6)	(0.9)
Net Carrying Amount, intangible assets subject to amortization	10.0	$ 3.3
Other
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	5.1
Accumulated Amortization, intangible assets subject to amortization	(2.4)
Net Carrying Amount, intangible assets subject to amortization	$ 2.7