Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 483.7	$ 328.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	198.7	195.2
Equity-based compensation expense	29.9	33.6
Deferred income taxes	(39.2)	(55.2)
Net loss on extinguishments of long-term debt	0.0	57.4
Other	8.7	3.9
Changes in assets and liabilities:
Accounts receivable	(334.3)	(120.7)
Merchandise inventory	(72.1)	(83.6)
Other assets	(66.1)	(181.6)
Accounts payable-trade	300.6	140.2
Other liabilities	92.4	121.6
Net cash provided by operating activities	602.3	439.1
Cash flows used in investing activities:
Capital expenditures	(53.4)	(58.6)
Net cash used in investing activities	(53.4)	(58.6)
Cash flows used in financing activities:
Proceeds from borrowings under revolving credit facilities	688.9	1,279.1
Repayments of borrowings under revolving credit facilities	(681.9)	(1,087.5)
Repayments of long-term debt	(18.2)	(11.2)
Proceeds from issuance of long-term debt	0.0	2,083.0
Payments to extinguish long-term debt	0.0	(2,121.3)
Payments of debt financing fees	(1.0)	(9.6)
Net change in accounts payable-inventory financing	(90.1)	(41.4)
Premium payments on interest rate cap agreements	(12.6)	0.0
Proceeds from stock option exercises	24.4	9.1
Proceeds from Coworker Stock Purchase Plan	8.4	7.6
Repurchases of common stock	(232.5)	(534.0)
Payment of incentive compensation plan withholding taxes	(27.1)	(42.0)
Dividends	(95.5)	(74.7)
Other	1.9	(4.7)
Net cash used in financing activities	(435.3)	(547.6)
Effect of exchange rate changes on cash and cash equivalents	(2.7)	1.3
Net increase (decrease) in cash and cash equivalents	110.9	(165.8)
Cash and cash equivalents—beginning of period	144.2	263.7
Cash and cash equivalents—end of period	255.1	97.9
Supplementary disclosure of cash flow information:
Interest paid	(117.4)	(118.6)
Taxes paid, net	$ (200.5)	$ (169.6)