Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	[1]	$ 54.2	$ 51.5	$ 42.7
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
LIFO and inventory provisions		13.2	2.0	16.0
Amortization of debt issuance costs		0.5	0.3	0.3
Stock-based compensation expense		6.1	8.7	6.1
Bad debt expense, net		2.0	1.3	2.2
Depreciation and amortization		42.9	37.9	32.0
Foreign currency transaction (gains) losses, net		(0.5)	1.8	0.1
Deferred income taxes		8.4	8.9	(3.0)
Settlement charge		1.3	1.6	0.0
Changes in operating assets and liabilities:
Accounts receivable, net		(59.2)	(28.1)	(13.8)
Other receivables, net		(37.0)	(8.9)	(3.0)
Inventories, net		(180.4)	1.5	(50.6)
Deposits, prepayments and other non-current assets		(19.9)	(25.9)	5.7
Excess tax deductions associated with stock-based compensation		(2.9)	(2.2)	(2.8)
Accounts payable		(11.0)	4.0	20.6
Cigarette and tobacco taxes payable		65.5	13.8	9.1
Pension, claims, accrued and other long-term liabilities		18.8	9.0	4.9
Net cash (used in) provided by operating activities		(98.0)	77.2	66.5
Cash flows from investing activities:
Acquisition of business, net of cash acquired		(88.4)	(9.0)	(1.0)
Change of restricted cash		(6.8)	4.5	(0.9)
Additions to property and equipment, net		(54.3)	(30.3)	(53.9)
Capitalization of software and related development costs		(7.7)	(8.7)	(5.3)
Proceeds from sale of property and equipment		0.0	0.3	0.0
Net cash used in investing activities		(157.2)	(43.2)	(61.1)
Cash flows from financing activities:
Borrowings under revolving credit facility		1,638.7	936.2	488.3
Repayments under revolving credit facility		(1,349.7)	(945.1)	(478.7)
Payments of financing costs		(2.0)	(0.4)	0.0
Dividends paid		(15.5)	(12.8)	(10.7)
Payments of capital leases		(2.4)	(2.3)	(1.7)
Repurchases of common stock		(8.9)	(9.2)	(8.0)
Proceeds from exercise of common stock options		0.3	0.4	2.1
Tax withholdings related to net share settlements of restricted stock units		(5.4)	(3.3)	(1.7)
Excess tax deductions associated with stock-based compensation		2.9	2.2	2.8
Book overdrafts, net		8.7	0.1	6.2
Net cash provided by (used in) financing activities		266.7	(34.2)	(1.4)
Effects of changes in foreign exchange rates		2.4	(1.7)	(0.6)
Change in cash and cash equivalents		13.9	(1.9)	3.4
Cash and cash equivalents, beginning of period		12.5	14.4	11.0
Cash and cash equivalents, end of period		26.4	12.5	14.4
Cash paid during the period for:
Income taxes paid, net		20.9	26.8	22.0
Interest paid		3.7	1.3	1.1
Unpaid property and equipment purchases included in accrued liabilities		2.9	5.1	1.4
Non-cash capital lease obligations incurred		$ 0.1	$ 5.4	$ 4.7

[1] Amounts have been rounded for presentation purposes and might differ from unrounded results.