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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, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 314.4		$ 308.8	$ 324.3	$ 273.8	$ 279.4	$ 269.4	$ 291.0	$ 249.7	$ 1,221.3		$ 1,089.5	$ 898.5
Long-lived assets	234.9	[1]				164.2				234.9	[1]	164.2	152.7
U.S.
Segment Reporting Information [Line Items]
Net sales										952.8		848.0	674.1
Long-lived assets	168.3					110.3				168.3		110.3	97.0
Canada
Segment Reporting Information [Line Items]
Net sales										169.0		150.9	142.6
Long-lived assets	62.7					50.4				62.7		50.4	52.3
Europe/Other
Segment Reporting Information [Line Items]
Net sales										99.5		90.6	81.8
Europe
Segment Reporting Information [Line Items]
Long-lived assets	3.6					3.2				3.6		3.2	3.1
Other
Segment Reporting Information [Line Items]
Long-lived assets	$ 0.3					$ 0.3				$ 0.3		$ 0.3	$ 0.3
[1] Amounts as of December 31, 2019 include operating lease right-of-use assets, as further described in Note 4 – Leases.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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