Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Jul. 10, 2017
Business Acquisition [Line Items]
Goodwill (tax deductible)	$ 72.8	$ 72.8
Farner-Bocken Company
Business Acquisition [Line Items]
Accounts receivable			$ 43.2
Other receivables			0.4
Inventories			35.5
Deposits and prepayments			10.2
Property and equipment			43.1
Goodwill (tax deductible)			36.8
Other intangible assets			22.6
Less: Capital lease liability			(15.8)
Less: Accrued liabilities, and other			(2.0)
Total consideration			$ 174.0