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Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | $ 905.9 | $ 777.7 | $ 604.0
Cash flows used in investing activities: |  |  |
Capital expenditures | (86.1) | (81.1) | (63.5)
Premium payments on interest rate cap agreements | 0.0 | 0.0 | (2.4)
Net cash used in investing activities | (86.1) | (81.1) | (65.9)
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 686.7 | 1,560.7 | 338.8
Repayments of borrowings under revolving credit facility | (686.7) | (1,560.7) | (338.8)
Repayments of long-term debt | (21.6) | (14.9) | (20.6)
Proceeds from issuance of long-term debt | 0.0 | 2,083.0 | 1,483.0
Net change in accounts payable-inventory financing | 0.0 | (2,121.3) | (1,490.4)
Payments to extinguish long-term debt |  |  | (1,490.4)
Net change in accounts payable-inventory financing | (67.4) | (84.0) | 143.6
Repurchases of common stock | (522.3) | (534.0) | (367.4)
Payment of incentive compensation plan withholding taxes | (33.9) | (49.6) | 0.0
Dividends | (139.4) | (106.9) | (78.7)
Repayment of intercompany loan | 0.0 | 0.0 | 0.0
Other | 29.8 | 9.0 | 25.9
Distributions and advances from (to) affiliates | 0.0 | 0.0 | 0.0
Net cash (used in) provided by financing activities | (754.8) | (818.7) | (304.6)
Effect of exchange rate changes on cash and cash equivalents | (3.4) | 2.6 | (7.4)
Net increase (decrease) in cash and cash equivalents | 61.6 | (119.5) | 226.1
Cash and cash equivalents – beginning of period | 144.2 | 263.7 | 37.6
Cash and cash equivalents – end of period | 205.8 | 144.2 | 263.7
Reportable Legal Entities | Affiliated Entity |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | 0.0 | 0.0 | 0.0
Cash flows used in investing activities: |  |  |
Capital expenditures | 0.0 | 0.0 | 0.0
Premium payments on interest rate cap agreements |  |  | 0.0
Net cash used in investing activities | 0.0 | 0.0 | 0.0
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of long-term debt | 0.0 | 0.0 | 0.0
Proceeds from issuance of long-term debt |  | 0.0 | 0.0
Net change in accounts payable-inventory financing |  | 0.0 |
Payments to extinguish long-term debt |  |  | 0.0
Net change in accounts payable-inventory financing | 0.0 | 0.0 | 0.0
Repurchases of common stock | 0.0 | 0.0 | 0.0
Payment of incentive compensation plan withholding taxes | 0.0 | 0.0 |
Dividends | 0.0 | 0.0 | 0.0
Repayment of intercompany loan | 0.0 | 0.0 | 0.0
Other | 0.0 | 0.0 | 0.0
Distributions and advances from (to) affiliates | 0.0 | 0.0 | 0.0
Net cash (used in) provided by financing activities | 0.0 | 0.0 | 0.0
Effect of exchange rate changes on cash and cash equivalents | 0.0 | 0.0 | 0.0
Net increase (decrease) in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents – beginning of period | 0.0 | 0.0 | 0.0
Cash and cash equivalents – end of period | 0.0 | 0.0 | 0.0
Reportable Legal Entities | Parent Guarantor |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | 0.0 | 0.6 | 0.0
Cash flows used in investing activities: |  |  |
Capital expenditures | 0.0 | 0.0 | 0.0
Premium payments on interest rate cap agreements |  |  | 0.0
Net cash used in investing activities | 0.0 | 0.0 | 0.0
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of long-term debt | 0.0 | 0.0 | 0.0
Proceeds from issuance of long-term debt |  | 0.0 | 0.0
Net change in accounts payable-inventory financing |  | 0.0 |
Payments to extinguish long-term debt |  |  | 0.0
Net change in accounts payable-inventory financing | 0.0 | 0.0 | 0.0
Repurchases of common stock | (522.3) | (534.0) | (367.4)
Payment of incentive compensation plan withholding taxes | (33.9) | (49.6) |
Dividends | (139.4) | (106.9) | (78.7)
Repayment of intercompany loan | 0.0 | 0.0 | 0.0
Other | 0.0 | 0.0 | 0.0
Distributions and advances from (to) affiliates | 695.6 | 689.9 | 446.1
Net cash (used in) provided by financing activities | 0.0 | (0.6) | 0.0
Effect of exchange rate changes on cash and cash equivalents | 0.0 | 0.0 | 0.0
Net increase (decrease) in cash and cash equivalents | 0.0 | 0.0 | 0.0
Cash and cash equivalents – beginning of period | 0.0 | 0.0 | 0.0
Cash and cash equivalents – end of period | 0.0 | 0.0 | 0.0
Reportable Legal Entities | Subsidiary Issuer |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | (85.7) | (71.1) | (158.5)
Cash flows used in investing activities: |  |  |
Capital expenditures | (40.8) | (55.2) | (50.9)
Premium payments on interest rate cap agreements |  |  | (2.4)
Net cash used in investing activities | (40.8) | (55.2) | (53.3)
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 640.0 | 1,501.5 | 329.6
Repayments of borrowings under revolving credit facility | (640.0) | (1,501.5) | (329.6)
Repayments of long-term debt | (14.9) | (14.9) | (15.2)
Proceeds from issuance of long-term debt |  | 2,083.0 | 1,483.0
Net change in accounts payable-inventory financing |  | (2,121.3) |
Payments to extinguish long-term debt |  |  | (1,490.4)
Net change in accounts payable-inventory financing | (0.8) | (0.2) | 1.5
Repurchases of common stock | 0.0 | 0.0 | 0.0
Payment of incentive compensation plan withholding taxes | 0.0 | 0.0 |
Dividends | 0.0 | 0.0 | 0.0
Repayment of intercompany loan | 0.0 | 0.0 | 0.0
Other | 34.6 | 14.1 | 12.2
Distributions and advances from (to) affiliates | 169.9 | 56.6 | 398.3
Net cash (used in) provided by financing activities | 188.8 | 17.3 | 389.4
Effect of exchange rate changes on cash and cash equivalents | 0.0 | 0.0 | 0.0
Net increase (decrease) in cash and cash equivalents | 62.3 | (109.0) | 177.6
Cash and cash equivalents – beginning of period | 113.7 | 222.7 | 45.1
Cash and cash equivalents – end of period | 176.0 | 113.7 | 222.7
Reportable Legal Entities | Guarantor Subsidiaries |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | 1,073.6 | 788.5 | 695.5
Cash flows used in investing activities: |  |  |
Capital expenditures | (34.5) | (6.3) | (7.6)
Premium payments on interest rate cap agreements |  |  | 0.0
Net cash used in investing activities | (34.5) | (6.3) | (7.6)
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of long-term debt | 0.0 | 0.0 | 0.0
Proceeds from issuance of long-term debt |  | 0.0 | 0.0
Net change in accounts payable-inventory financing |  | 0.0 |
Payments to extinguish long-term debt |  |  | 0.0
Net change in accounts payable-inventory financing | (74.7) | (78.4) | 131.0
Repurchases of common stock | 0.0 | 0.0 | 0.0
Payment of incentive compensation plan withholding taxes | 0.0 | 0.0 |
Dividends | 0.0 | 0.0 | 0.0
Repayment of intercompany loan | 47.5 | 34.3 | 40.4
Other | (4.4) | (4.0) | 16.7
Distributions and advances from (to) affiliates | (1,007.5) | (737.2) | (872.9)
Net cash (used in) provided by financing activities | (1,039.1) | (785.3) | (684.8)
Effect of exchange rate changes on cash and cash equivalents | 0.0 | 0.0 | 0.0
Net increase (decrease) in cash and cash equivalents | 0.0 | (3.1) | 3.1
Cash and cash equivalents – beginning of period | 0.0 | 3.1 | 0.0
Cash and cash equivalents – end of period | 0.0 | 0.0 | 3.1
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | 75.0 | 52.3 | 56.1
Cash flows used in investing activities: |  |  |
Capital expenditures | (10.8) | (19.6) | (5.0)
Premium payments on interest rate cap agreements |  |  | 0.0
Net cash used in investing activities | (10.8) | (19.6) | (5.0)
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 46.7 | 59.2 | 9.2
Repayments of borrowings under revolving credit facility | (46.7) | (59.2) | (9.2)
Repayments of long-term debt | (6.7) | 0.0 | (5.4)
Proceeds from issuance of long-term debt |  | 0.0 | 0.0
Net change in accounts payable-inventory financing |  | 0.0 |
Payments to extinguish long-term debt |  |  | 0.0
Net change in accounts payable-inventory financing | 8.1 | (5.4) | 11.1
Repurchases of common stock | 0.0 | 0.0 | 0.0
Payment of incentive compensation plan withholding taxes | 0.0 | 0.0 |
Dividends | 0.0 | 0.0 | 0.0
Repayment of intercompany loan | (47.5) | (34.3) | (40.4)
Other | (0.4) | (1.1) | (3.0)
Distributions and advances from (to) affiliates | 0.0 | 0.0 | 0.0
Net cash (used in) provided by financing activities | (46.5) | (40.8) | (37.7)
Effect of exchange rate changes on cash and cash equivalents | (3.4) | 2.6 | (7.4)
Net increase (decrease) in cash and cash equivalents | 14.3 | (5.5) | 6.0
Cash and cash equivalents – beginning of period | 32.4 | 37.9 | 31.9
Cash and cash equivalents – end of period | 46.7 | 32.4 | 37.9
Consolidating Adjustments |  |  |
Supplemental Guarantor Information [Line Items] |  |  |
Net cash provided by (used in) operating activities | (157.0) | 7.4 | 10.9
Cash flows used in investing activities: |  |  |
Capital expenditures | 0.0 | 0.0 | 0.0
Premium payments on interest rate cap agreements |  |  | 0.0
Net cash used in investing activities | 0.0 | 0.0 | 0.0
Cash flows used in financing activities: |  |  |
Proceeds from borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of borrowings under revolving credit facility | 0.0 | 0.0 | 0.0
Repayments of long-term debt | 0.0 | 0.0 | 0.0
Proceeds from issuance of long-term debt |  | 0.0 | 0.0
Net change in accounts payable-inventory financing |  | 0.0 |
Payments to extinguish long-term debt |  |  | 0.0
Net change in accounts payable-inventory financing | 0.0 | 0.0 | 0.0
Repurchases of common stock | 0.0 | 0.0 | 0.0
Payment of incentive compensation plan withholding taxes | 0.0 | 0.0 |
Dividends | 0.0 | 0.0 | 0.0
Repayment of intercompany loan | 0.0 | 0.0 | 0.0
Other | 0.0 | 0.0 | 0.0
Distributions and advances from (to) affiliates | 142.0 | (9.3) | 28.5
Net cash (used in) provided by financing activities | 142.0 | (9.3) | 28.5
Effect of exchange rate changes on cash and cash equivalents | 0.0 | 0.0 | 0.0
Net increase (decrease) in cash and cash equivalents | (15.0) | (1.9) | 39.4
Cash and cash equivalents – beginning of period | (1.9) | 0.0 | (39.4)
Cash and cash equivalents – end of period | $ (16.9) | $ (1.9) | $ 0.0

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