Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business acquisition, cash paid		$ 39.7	$ 23.4	$ 0.0
Goodwill acquired during the period	$ 86.6	100.2	86.6	$ 82.0	$ 89.5
Intangible assets, net	96.6	99.5	$ 96.6
2017 acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue since acquisition		18.5
Business acquisition, cash paid		39.7
Goodwill acquired during the period		8.4
Intangible assets, net		2.0
GH Electrotermia S.A.
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business acquisition, cash paid	23.4
Cash acquired	$ 6.3
Debt assumed in acquisition		13.9
Contingent consideration, fair value of earn-out		$ 2.1