Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 57.6	$ 77.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	64.2	64.0
Equity based compensation expense	12.1	8.6
Increase (Decrease) in Deferred Income Taxes	(19.1)	(25.0)
Allowance for doubtful accounts	2.3	0.0
Amortization of deferred financing costs, debt premium and debt discount, net	3.2	1.6
Net loss on extinguishments of long-term debt	(57.4)	0.0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(0.5)	0.0
Gain (Loss) on Disposition of Property Plant Equipment	(0.2)	0.0
Changes in assets and liabilities:
Accounts receivable	184.6	237.6
Merchandise inventory	(40.3)	(68.2)
Other assets	(20.2)	9.4
Accounts payable trade	(10.4)	91.0
Other current liabilities	83.9	38.0
Long-term liabilities	(4.7)	(7.0)
Net cash provided by operating activities	369.9	427.8
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	(19.6)	(11.0)
Net cash used in investing activities	(19.6)	(11.0)
Cash flows from financing activities:
Proceeds from Lines of Credit	44.1	63.4
Repayments of Lines of Credit	(6.1)	(63.4)
Repayments of long-term debt	(3.7)	(6.7)
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 Financing Costs	(9.6)	0.0
Net change in accounts payable-inventory financing	(135.7)	(66.5)
Proceeds from stock option exercises	4.4	1.2
Proceeds from Coworker Stock Purchase Plan	2.1	1.9
Payments for Repurchase of Common Stock	(175.4)	(118.0)
Payment of incentive compensation plan withholding taxes related to the acceleration of share vesting	(18.3)	0.0
Dividends paid	(25.5)	(18.0)
Proceeds from (Payments for) Other Financing Activities	(0.2)	(0.5)
Net cash used in financing activities	(362.2)	(206.6)
Effect of exchange rate changes on cash and cash equivalents	(0.1)	0.4
Net increase (decrease) in cash and cash equivalents	(12.0)	210.6
Cash and cash equivalents - beginning of period	263.7	37.6
Cash and cash equivalents - end of period	251.7	248.2
Supplementary disclosure of cash flow information:
Interest paid	(48.4)	(44.1)
Taxes paid, net	$ (6.3)	$ (6.8)