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Business Combinations - Hudson Narratives (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Sep. 20, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition
Payment for acquisition of businesses, net of cash acquired				$ 12.5	$ 23.2
Borrowings on revolving credit facilities				65.0	2.2
Sales		$ 319.9	$ 238.2	599.6	442.3
Operating income		23.5	9.9	40.4	10.2
Amortization expense		5.7	$ 3.1	11.8	$ 6.1
Hudson
Business Acquisition
Payment for acquisition of businesses, net of cash acquired	$ 419.5
Borrowings on revolving credit facilities	$ 300.0
Sales		47.5		90.8
Operating income		6.1		10.3
Amortization expense		$ 3.0		$ 6.0
Hudson \| Minimum
Business Acquisition
Finite lived intangible assets useful life	2 years
Hudson \| Maximum
Business Acquisition
Finite lived intangible assets useful life	15 years