Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 144.9	$ 143.7	$ 71.9
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	50.5	49.6	48.9
Non-cash operating lease expense	30.1
Deferred income taxes	(3.7)	3.4	14.2
Net gains on disposal of assets	(1.5)		(0.1)
Losses on impairment of assets	0.3	0.3
Net income attributable to noncontrolling interests	(0.4)	(0.4)	(0.3)
Changes in assets and liabilities, net of acquisitions:
Trade receivables	92.2	(125.4)	(97.5)
Merchandise inventory	4.5	(101.9)	(63.8)
Other current assets	2.4	2.1	(10.9)
Other non-current assets	(1.7)	(9.0)	(0.5)
Trade accounts payable	(62.8)	59.7	83.3
Accrued payroll and benefit costs	(7.1)	38.8	(2.1)
Other current liabilities	5.8	5.6	13.3
Other non-current liabilities	(4.1)	(24.4)	(11.3)
Total adjustments to net income	104.5	(101.6)	(26.8)
Net cash provided by operating activities	249.4	42.1	45.1
Cash Flows from Investing Activities
Proceeds from disposal of assets	3.7	0.7	2.2
Capital expenditures for property	(43.1)	(43.0)	(41.3)
Net cash used by investing activities	(39.4)	(42.3)	(39.1)
Cash Flows from Financing Activities
Net (decrease) increase in short-term borrowings	(97.0)	65.4	29.1
Principal payments under finance arrangements	(3.7)	(4.0)	(4.2)
Sales of common stock	18.5	17.8	17.4
Purchases of common stock	(19.2)	(15.7)	(13.7)
Sales of noncontrolling interests’ common stock	0.8		0.6
Purchases of noncontrolling interests’ common stock	(0.3)	(0.3)	(0.3)
Dividends paid	(107.2)	(46.9)	(35.4)
Net cash provided (used) by financing activities	(208.1)	16.3	(6.5)
Net Increase (Decrease) in Cash	1.9	16.1	(0.5)
Cash, Beginning of Year	58.9	42.8	43.3
Cash, End of Year	60.8	58.9	42.8
Non-cash Investing and Financing Activities:
Acquisitions of equipment under capital leases	2.0	3.1	1.9
Acquisitions of assets under operating leases	55.9
Acquisition of software and maintenance under financing arrangement		5.0
Cash Paid During the Year for:
Interest, net of amounts capitalized	6.1	6.3	4.2
Income taxes, net of refunds	$ 60.7	$ 38.3	$ 78.4