Supplemental Guarantor Information Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	$ 366.3	$ 317.4	$ 214.7
Capital expenditures	(47.1)	(41.4)	(45.7)
Payments for Hedge, Investing Activities	0	0	6.6
Premium payments on interest rate cap agreements	0	(0.3)	(3.7)
Net cash used in investing activities	(47.1)	(41.7)	(56.0)
Proceeds from borrowings under revolving credit facility	63.0	289.0	1,295.0
Repayments of borrowings under revolving credit facility	(63.0)	(289.0)	(1,483.2)
Repayments of long-term debt	(51.1)	(201.0)	(132.0)
Proceeds from issuance of long-term debt	1,535.2	135.7	1,175.0
Payments to extinguish long-term debt	(2,047.4)	(243.2)	(1,175.0)
Payments of debt financing costs	(6.1)	(2.1)	(26.3)
Net change in accounts payable-inventory financing	7.4	(29.5)	250.5
Payment of incentive compensation plan withholding taxes	(24.1)	0	0
Net proceeds from issuance of common shares	424.7	0	0
Dividends paid	(7.3)	0	0
Net cash provided by (used in) financing activities	(168.3)	(338.0)	(95.4)
Effect of exchange rate changes on cash and cash equivalents	(0.7)	0.3	0
Net increase (decrease) in cash and cash equivalents	150.2	(62.0)	63.3
Cash and cash equivalents - beginning of period	37.9	99.9	36.6
Cash and cash equivalents - end of period	188.1	37.9	99.9
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	(15.2)	0	0
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities			0
Premium payments on interest rate cap agreements		0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0
Net proceeds from issuance of common shares	424.7
Dividends paid	(7.3)
Advances to (from) affiliates	(402.2)	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	15.2	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents - beginning of period	0	0	0
Cash and cash equivalents - end of period	0	0	0
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	(130.3)	(204.3)	(93.8)
Capital expenditures	(40.8)	(27.0)	(33.4)
Payments for Hedge, Investing Activities			6.6
Premium payments on interest rate cap agreements		(0.3)	(3.7)
Net cash used in investing activities	(40.8)	(27.3)	(43.7)
Proceeds from borrowings under revolving credit facility	63.0	289.0	1,295.0
Repayments of borrowings under revolving credit facility	(63.0)	(289.0)	(1,483.2)
Repayments of long-term debt	(51.1)	(201.0)	(132.0)
Proceeds from issuance of long-term debt	1,535.2	135.7	1,175.0
Payments to extinguish long-term debt	(2,047.4)	(243.2)	(1,175.0)
Payments of debt financing costs	(6.1)	(2.1)	(26.3)
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	(4.0)
Net proceeds from issuance of common shares	0
Dividends paid	0
Advances to (from) affiliates	892.6	486.0	552.6
Other financing activities	0.4	2.1	0.6
Net cash provided by (used in) financing activities	319.6	177.5	206.7
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	148.5	(54.1)	69.2
Cash and cash equivalents - beginning of period	48.0	102.1	32.9
Cash and cash equivalents - end of period	196.5	48.0	102.1
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	508.8	514.2	327.5
Capital expenditures	(6.2)	(14.0)	(10.6)
Payments for Hedge, Investing Activities			0
Premium payments on interest rate cap agreements		0	0
Net cash used in investing activities	(6.2)	(14.0)	(10.6)
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	7.4	(29.5)	250.5
Payment of incentive compensation plan withholding taxes	(19.6)
Net proceeds from issuance of common shares	0
Dividends paid	0
Advances to (from) affiliates	(490.4)	(486.5)	(552.7)
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	(502.6)	(516.0)	(302.2)
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	(15.8)	14.7
Cash and cash equivalents - beginning of period	0	15.8	1.1
Cash and cash equivalents - end of period	0	0	15.8
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	5.5	1.3	(0.3)
Capital expenditures	(0.1)	(0.4)	(1.7)
Payments for Hedge, Investing Activities			0
Premium payments on interest rate cap agreements		0	0
Net cash used in investing activities	(0.1)	(0.4)	(1.7)
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	(0.5)
Net proceeds from issuance of common shares	0
Dividends paid	0
Advances to (from) affiliates	0	0.5	0.1
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	(0.5)	0.5	0.1
Effect of exchange rate changes on cash and cash equivalents	(0.7)	0.3	0
Net increase (decrease) in cash and cash equivalents	4.2	1.7	(1.9)
Cash and cash equivalents - beginning of period	9.8	8.1	10.0
Cash and cash equivalents - end of period	14.0	9.8	8.1
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	0	0	0
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities			0
Premium payments on interest rate cap agreements		0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0
Net proceeds from issuance of common shares	0
Dividends paid	0
Advances to (from) affiliates	0	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents - beginning of period	0	0	0
Cash and cash equivalents - end of period	0	0	0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	(2.5)	6.2	(18.7)
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities			0
Premium payments on interest rate cap agreements		0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0
Net proceeds from issuance of common shares	0
Dividends paid	0
Advances to (from) affiliates	0	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(2.5)	6.2	(18.7)
Cash and cash equivalents - beginning of period	(19.9)	(26.1)	(7.4)
Cash and cash equivalents - end of period	(22.4)	(19.9)	(26.1)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by (used in) operating activities	366.3	317.4	214.7
Capital expenditures	(47.1)	(41.4)	(45.7)
Payments for Hedge, Investing Activities			6.6
Premium payments on interest rate cap agreements		(0.3)	(3.7)
Net cash used in investing activities	(47.1)	(41.7)	(56.0)
Proceeds from borrowings under revolving credit facility	63.0	289.0	1,295.0
Repayments of borrowings under revolving credit facility	(63.0)	(289.0)	(1,483.2)
Repayments of long-term debt	(51.1)	(201.0)	(132.0)
Proceeds from issuance of long-term debt	1,535.2	135.7	1,175.0
Payments to extinguish long-term debt	(2,047.4)	(243.2)	(1,175.0)
Payments of debt financing costs	(6.1)	(2.1)	(26.3)
Net change in accounts payable-inventory financing	7.4	(29.5)	250.5
Payment of incentive compensation plan withholding taxes	(24.1)
Net proceeds from issuance of common shares	424.7
Dividends paid	(7.3)
Advances to (from) affiliates	0	0	0
Other financing activities	0.4	2.1	0.6
Net cash provided by (used in) financing activities	(168.3)	(338.0)	(95.4)
Effect of exchange rate changes on cash and cash equivalents	(0.7)	0.3	0
Net increase (decrease) in cash and cash equivalents	150.2	(62.0)	63.3
Cash and cash equivalents - beginning of period	37.9	99.9	36.6
Cash and cash equivalents - end of period	$ 188.1	$ 37.9	$ 99.9