Business Combinations (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 02, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase price, net of cash acquired		$ 73.0	$ 20.9
Goodwill		635.6		$ 610.5
IQAP
Business Acquisition [Line Items]
Purchase price, net of cash acquired	$ 73.0
Intangible assets acquired	31.9
Property, plant and equipment	24.1
Goodwill	23.8
Other liabilities	21.1
Net working capital acquired	$ 14.4
Sales from companies acquired since acquisition date		$ 16.7
Minimum | IQAP
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	13 years
Maximum | IQAP
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	20 years