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Business Combinations - Hudson Narrative (Details) € in Millions				3 Months Ended								12 Months Ended
	Nov. 15, 2018 USD ($)	Nov. 15, 2018 EUR (€)	Sep. 20, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition
Payment for acquisition of businesses, net of cash acquired												$ 225,800,000	$ 446,100,000	$ 1,400,000
Borrowings on revolving credit facilities	$ 160,300,000	€ 140.0										411,700,000	302,200,000	3,800,000
Restricted cash and restricted cash equivalents				$ 1,000,000				$ 6,400,000				1,000,000	6,400,000
Sales				290,100,000	$ 272,200,000	$ 277,900,000	$ 244,100,000	269,400,000	$ 202,700,000	$ 199,800,000	$ 171,000,000	1,084,300,000	842,900,000	722,000,000
Operating income				$ 26,300,000	$ 31,500,000	$ 19,300,000	$ 15,000,000	20,900,000	7,200,000	$ 8,500,000	$ 1,900,000	92,100,000	38,500,000	41,000,000
Amortization expense												21,900,000	12,200,000	8,800,000
Acquisition related costs												2,100,000	10,100,000	$ 400,000
Hudson
Business Acquisition
Payment for acquisition of businesses, net of cash acquired			$ 419,500,000
Borrowings on revolving credit facilities			$ 300,000,000
Sales								51,900,000	6,100,000			180,300,000	58,000,000
Operating income								5,200,000	$ 1,200,000			19,000,000	6,400,000
Amortization expense												$ 12,000,000	3,300,000
Acquisition related costs													9,000,000
Minimum
Business Acquisition
Finite lived intangible asset useful life												2 years
Minimum \| Hudson
Business Acquisition
Finite lived intangible asset useful life												2 years
Maximum
Business Acquisition
Finite lived intangible asset useful life												15 years
Maximum \| Hudson
Business Acquisition
Finite lived intangible asset useful life												15 years
Hudson
Business Acquisition
Restricted cash and restricted cash equivalents								$ 2.3					$ 2.3