Segment and Geographic Information - Information by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 4,495.9	$ 4,263.9	$ 8,428.1	$ 8,203.2
Income before income taxes	23.8	22.6	34.9	28.7
Interest expense, net	2.4	2.8	5.5	6.3
Depreciation and amortization	17.5	16.7	34.9	32.4
Capital expenditures:	5.4	4.8	10.0	9.8
Reserve for total tax audit claim	3.8		3.8
Interest income	0.0	0.1	0.0	0.2
Cigarettes
Segment Reporting Information [Line Items]
Net sales	2,899.9	2,892.6	5,487.6	5,475.3
Cigarettes | United States
Segment Reporting Information [Line Items]
Inventory holding gains			8.3
OTP
Segment Reporting Information [Line Items]
Net sales	422.3	390.9	809.9	750.9
OTP | Canada
Segment Reporting Information [Line Items]
Reserve for total tax audit claim	3.8		3.8
Operating Segment | United States
Segment Reporting Information [Line Items]
Net sales	4,053.0	3,860.0	7,623.1	7,439.6
Income before income taxes	43.6	26.0	69.2	35.2
Interest expense, net	15.3	15.3	29.8	29.9
Depreciation and amortization	12.9	11.0	25.4	21.8
Capital expenditures:	5.2	3.8	9.3	8.2
Operating Segment | Canada
Segment Reporting Information [Line Items]
Net sales	435.0	394.6	789.4	743.0
Income before income taxes	1.2	1.8	1.7	4.3
Interest expense, net	0.6	(0.2)	1.3	0.3
Depreciation and amortization	1.1	0.8	2.2	1.6
Capital expenditures:	0.2	1.0	0.7	1.6
Corporate
Segment Reporting Information [Line Items]
Net sales	7.9	9.3	15.6	20.6
Income before income taxes	(21.0)	(5.2)	(36.0)	(10.8)
Interest expense, net	(13.5)	(12.3)	(25.6)	(23.9)
Depreciation and amortization	$ 3.5	$ 4.9	$ 7.3	$ 9.0