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Segment Information - Segment Information Classified Based on Geographic Location (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 279.4	$ 269.4	$ 291.0	$ 249.7	$ 247.6	$ 248.7	$ 224.4	$ 177.8	$ 1,089.5	$ 898.5	$ 707.9
Long-lived assets (excluding deferred tax and intangible assets)	164.2				152.7				164.2	152.7	127.6
U.S.
Segment Reporting Information [Line Items]
Net sales									848.0	674.1	510.2
Long-lived assets (excluding deferred tax and intangible assets)	110.3				97.0				110.3	97.0	78.7
Canada
Segment Reporting Information [Line Items]
Net sales									150.9	142.6	111.5
Long-lived assets (excluding deferred tax and intangible assets)	50.4				52.3				50.4	52.3	46.1
Europe/Other
Segment Reporting Information [Line Items]
Net sales									90.6	81.8	86.2
Europe
Segment Reporting Information [Line Items]
Long-lived assets (excluding deferred tax and intangible assets)	3.2				3.1				3.2	3.1	2.5
Other
Segment Reporting Information [Line Items]
Long-lived assets (excluding deferred tax and intangible assets)	$ 0.3				$ 0.3				$ 0.3	$ 0.3	$ 0.3