Balance Sheet Accounts and Supplemental Disclosures - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2015	Feb. 24, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 161.3	$ 158.1
Gross Carrying Amount		161.6	157.3
Accumulated Amortization		76.1	62.9
Net Carrying Amount		85.5	94.4
Amortization expense	$ 1.1	13.7	13.3	$ 13.4
2018		13.7
2019		13.6
2020		13.4
2021		9.9
2022		6.6
Total		57.2
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		87.2	83.8
Accumulated Amortization		46.9	37.4
Net Carrying Amount		40.3	46.4
Intellectual property\trade secrets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		34.2	34.2
Accumulated Amortization		11.8	9.2
Net Carrying Amount		22.4	25.0
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			0.5
Accumulated Amortization			0.5
Net Carrying Amount			0.0
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		21.0	20.5
Accumulated Amortization		3.1	2.4
Net Carrying Amount		17.9	18.1
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		19.2	18.3
Accumulated Amortization		14.3	13.4
Net Carrying Amount		$ 4.9	$ 4.9
Coleman Aerospace
Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 3.2