Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2017	Feb. 24, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill (Consideration less total identifiable net assets acquired)	$ 161.3		$ 158.1
Coleman Aerospace
Business Acquisition [Line Items]
Current assets		$ 12.0
Property, plant and equipment		1.9
Total tangible assets acquired		13.9
Intangible assets acquired		4.8
Deferred income taxes		0.3
Total assets acquired		19.0
Liabilities assumed, current		(5.2)
Total identifiable net assets acquired		13.8
Goodwill (Consideration less total identifiable net assets acquired)		$ 3.2