Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 63.2	$ 57.7	$ 45.5
Adjustments to reconcile net income to net cash provided by operating activities:
LIFO and inventory provisions	34.2	27.7	25.9
Amortization of debt issuance costs	0.8	0.8	0.8
Stock-based compensation expense	10.2	9.6	8.2
Credit loss expense, net	7.6	7.1	3.6
Impairment charge and other	0.6	0.0	0.0
Loss on disposals	0.4	0.0	0.6
Depreciation and amortization	66.6	60.9	59.5
Foreign currency transaction losses (gains)	0.9	0.8	(1.8)
Deferred income taxes	(20.5)	(4.7)	(0.1)
Changes in operating assets and liabilities:
Accounts receivable, net	33.1	(5.2)	29.0
Other receivables, net	(9.0)	(6.2)	4.3
Inventories, net	(119.8)	(5.0)	(34.4)
Deposits, prepayments and other non-current assets	20.2	(42.9)	23.6
Accounts payable	(1.2)	(8.6)	31.0
Cigarette and tobacco taxes payable	21.5	(20.0)	(2.3)
Claims, accrued and other long-term liabilities	39.0	17.7	17.8
Net cash provided by operating activities	147.8	89.7	211.2
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0.0	(2.5)	(2.5)
Additions to property and equipment, net	(27.2)	(22.8)	(20.1)
Capitalization of software and related development costs	(3.5)	(6.0)	(2.0)
Proceeds from sale of property and equipment	0.0	0.3	0.2
Proceeds from sale of other non-current assets	1.1	0.0	0.0
Net cash used in investing activities	(29.6)	(31.0)	(24.4)
Cash flows from financing activities:
Borrowings under revolving credit facility	1,817.1	1,692.6	1,769.9
Repayments under revolving credit facility	(1,883.9)	(1,687.8)	(1,938.1)
Payments of finance leases	(13.1)	(5.6)	(3.0)
Dividends paid	(22.3)	(20.7)	(18.9)
Repurchases of common stock	(10.4)	(22.0)	(15.5)
Tax withholdings related to net share settlements of restricted stock units	(2.5)	(2.2)	(1.7)
Increase (Decrease) in book overdrafts, net	7.2	(25.5)	4.1
Net cash used in financing activities	(107.9)	(71.2)	(203.2)
Effects of changes in foreign exchange rates	(1.6)	(0.7)	2.1
Change in cash, cash equivalents and restricted cash	8.7	(13.2)	(14.3)
Cash, cash equivalents and restricted cash at beginning of period	14.1	27.3	41.6
Cash, cash equivalents and restricted cash at end of period	22.8	14.1	27.3
Cash received (paid) during the period for:
Income taxes, net	(29.8)	(18.7)	10.1
Interest paid	(6.2)	(12.0)	(13.0)
Unpaid property and equipment purchases included in accrued liabilities	0.0	0.0	0.1
Non-cash transactions between other non-current assets and other long-term liabilities	$ 0.0	$ 4.7	$ 0.0