Segment and Geographic Information - Information by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 3,939.3	$ 3,754.1
Income before income taxes:	6.1	1.8
Interest expense, net	3.5	3.4
Depreciation and amortization	15.7	15.4
Capital expenditures:	5.0	5.1
Interest income	0.1	0.1
Operating Segment | United States
Segment Reporting Information [Line Items]
Net sales	3,579.6	3,414.4
Income before income taxes:	9.2	9.3
Interest expense, net	14.6	13.0
Depreciation and amortization	10.8	10.5
Capital expenditures:	4.4	5.0
Operating Segment | Canada
Segment Reporting Information [Line Items]
Net sales	348.4	326.6
Income before income taxes:	2.4	1.8
Interest expense, net	0.5	0.5
Depreciation and amortization	0.8	0.6
Capital expenditures:	0.6	0.1
Corporate
Segment Reporting Information [Line Items]
Net sales	11.3	13.1
Income before income taxes:	(5.5)	(9.3)
Interest expense, net	(11.6)	(10.1)
Depreciation and amortization	$ 4.1	$ 4.3