Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 198.7	$ 195.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	129.5	127.7
Equity-based compensation expense	23.6	18.1
Deferred income taxes	(40.3)	(49.9)
Allowance for doubtful accounts	0.2	0.0
Amortization of deferred financing costs, debt premium and debt discount, net	3.7	3.3
Net loss on extinguishments of long-term debt	57.4	0.0
Gain on interest rate cap agreements	(0.5)	0.0
Other	(0.2)	0.0
Changes in assets and liabilities:
Accounts receivable	(156.3)	(74.9)
Merchandise inventory	(57.8)	(99.0)
Other assets	(120.9)	(44.4)
Accounts payable-trade	311.8	219.3
Other current liabilities	34.4	23.5
Long-term liabilities	(7.1)	(5.9)
Net cash provided by operating activities	376.2	313.1
Cash flows from investing activities:
Capital expenditures	(36.8)	(25.7)
Net cash used in investing activities	(36.8)	(25.7)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facilities	67.7	105.4
Repayments of borrowings under revolving credit facilities	(13.7)	(105.4)
Repayments of long-term debt	(7.5)	(13.4)
Proceeds from issuance of long-term debt	2,083.0	0.0
Payments to extinguish long-term debt	(2,121.3)	0.0
Payments of debt financing costs	(9.6)	0.0
Net change in accounts payable-inventory financing	(85.1)	71.3
Proceeds from stock option exercises	7.4	3.8
Payment of incentive compensation plan withholding taxes	(42.0)
Payment of incentive compensation plan withholding taxes		0.7
Proceeds from Coworker Stock Purchase Plan	4.7	4.5
Repurchases of common stock	(359.4)	(223.1)
Dividends	(50.3)	(35.7)
Principal payments under capital lease obligations	(0.6)	(0.8)
Net cash used in financing activities	(526.7)	(192.7)
Effect of exchange rate changes on cash and cash equivalents	2.6	(2.9)
Net (decrease) increase in cash and cash equivalents	(184.7)	91.8
Cash and cash equivalents—beginning of period	263.7	37.6
Cash and cash equivalents—end of period	79.0	129.4
Supplementary disclosure of cash flow information:
Cash paid for Interest, net	(76.8)	(73.0)
Cash paid for Income taxes, net	$ (96.5)	$ (132.7)