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Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 255.1 | $ 144.2 | $ 97.9 | $ 263.7
Accounts receivable, net | 2,650.5 | 2,329.3 |  |
Merchandise inventory | 481.1 | 411.5 |  |
Miscellaneous receivables | 370.4 | 343.0 |  |
Prepaid expenses and other | 192.4 | 168.3 |  |
Total current assets | 3,949.5 | 3,396.3 |  |
Property and equipment, net | 147.8 | 161.1 |  |
Goodwill | 2,469.5 | 2,479.6 |  |
Other intangible assets, net | 758.2 | 897.0 |  |
Other assets | 50.4 | 32.7 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 7,375.4 | 6,966.7 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,609.9 | 1,317.7 |  |
Accounts payable-inventory financing | 407.6 | 498.0 |  |
Current maturities of long-term debt | 32.0 | 25.5 |  |
Contract liabilities | 188.5 | 158.8 |  |
Accrued expenses and other current liabilities | 565.9 | 522.1 |  |
Total current liabilities | 2,803.9 | 2,522.1 |  |
Long-term liabilities: |  |  |  |
Debt | 3,187.4 | 3,210.0 |  |
Deferred income taxes | 158.4 | 196.3 |  |
Other liabilities | 65.0 | 52.7 |  |
Total long-term liabilities | 3,410.8 | 3,459.0 |  |
Total stockholders' equity | 1,160.7 | 982.9 |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 7,375.4 | 6,966.7 |  |
Consolidating Adjustments |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | (15.3) | (1.9) | (11.7) | 0.0
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 0.0 | 0.0 |  |
Prepaid expenses and other | 0.0 | 0.0 |  |
Total current assets | (15.3) | (1.9) |  |
Property and equipment, net | 0.0 | 0.0 |  |
Goodwill | 0.0 | 0.0 |  |
Other intangible assets, net | 0.0 | 0.0 |  |
Other assets | (169.8) | (211.6) |  |
Investment in and advances to subsidiaries | (4,274.6) | (4,050.0) |  |
Total Assets | (4,459.7) | (4,263.5) |  |
Current liabilities: |  |  |  |
Accounts payable-trade | (15.3) | (1.9) |  |
Accounts payable-inventory financing | 0.0 | 0.0 |  |
Current maturities of long-term debt | 0.0 | 0.0 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 0.0 | 0.0 |  |
Total current liabilities | (15.3) | (1.9) |  |
Long-term liabilities: |  |  |  |
Debt | 0.0 | 0.0 |  |
Deferred income taxes | (1.4) | (1.7) |  |
Other liabilities | (168.4) | (209.9) |  |
Total long-term liabilities | (169.8) | (211.6) |  |
Total stockholders' equity | (4,274.6) |  |  |
Total stockholders' equity |  | (4,050.0) |  |
Total Liabilities and Stockholders' Equity | (4,459.7) | (4,263.5) |  |
Parent Guarantor | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 | 0.0
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 0.0 | 0.0 |  |
Prepaid expenses and other | 0.0 | 0.0 |  |
Total current assets | 0.0 | 0.0 |  |
Property and equipment, net | 0.0 | 0.0 |  |
Goodwill | 0.0 | 0.0 |  |
Other intangible assets, net | 0.0 | 0.0 |  |
Other assets | 1.4 | 1.7 |  |
Investment in and advances to subsidiaries | 1,159.3 | 983.9 |  |
Total Assets | 1,160.7 | 985.6 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 0.0 | 0.0 |  |
Accounts payable-inventory financing | 0.0 | 0.0 |  |
Current maturities of long-term debt | 0.0 | 0.0 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 0.0 | 0.0 |  |
Total current liabilities | 0.0 | 0.0 |  |
Long-term liabilities: |  |  |  |
Debt | 0.0 | 0.0 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Other liabilities | 0.0 | 0.0 |  |
Total long-term liabilities | 0.0 | 0.0 |  |
Total stockholders' equity | 1,160.7 |  |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 1,160.7 | 985.6 |  |
Subsidiary Issuer | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 220.9 | 113.7 | 79.3 | 222.7
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 123.6 | 103.9 |  |
Prepaid expenses and other | 17.4 | 18.0 |  |
Total current assets | 361.9 | 235.6 |  |
Property and equipment, net | 84.4 | 95.0 |  |
Goodwill | 751.8 | 751.8 |  |
Other intangible assets, net | 272.7 | 280.1 |  |
Other assets | 64.9 | 30.7 |  |
Investment in and advances to subsidiaries | 3,115.3 | 3,066.1 |  |
Total Assets | 4,651.0 | 4,459.3 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 24.9 | 42.5 |  |
Accounts payable-inventory financing | 0.2 | 1.0 |  |
Current maturities of long-term debt | 14.9 | 14.9 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 217.1 | 173.3 |  |
Total current liabilities | 257.1 | 231.7 |  |
Long-term liabilities: |  |  |  |
Debt | 3,124.2 | 3,134.2 |  |
Deferred income taxes | 63.4 | 66.5 |  |
Other liabilities | 47.0 | 43.0 |  |
Total long-term liabilities | 3,234.6 | 3,243.7 |  |
Total stockholders' equity | 1,159.3 |  |  |
Total stockholders' equity |  | 983.9 |  |
Total Liabilities and Stockholders' Equity | 4,651.0 | 4,459.3 |  |
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 | 3.1
Accounts receivable, net | 2,338.3 | 2,015.7 |  |
Merchandise inventory | 419.7 | 354.6 |  |
Miscellaneous receivables | 228.6 | 211.1 |  |
Prepaid expenses and other | 133.3 | 100.4 |  |
Total current assets | 3,119.9 | 2,681.8 |  |
Property and equipment, net | 40.9 | 43.5 |  |
Goodwill | 1,439.0 | 1,439.0 |  |
Other intangible assets, net | 317.4 | 424.5 |  |
Other assets | 151.8 | 209.3 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 5,069.0 | 4,798.1 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,431.2 | 1,112.1 |  |
Accounts payable-inventory financing | 395.1 | 480.9 |  |
Current maturities of long-term debt | 4.1 | 3.8 |  |
Contract liabilities | 112.8 | 87.5 |  |
Accrued expenses and other current liabilities | 283.3 | 262.0 |  |
Total current liabilities | 2,226.5 | 1,946.3 |  |
Long-term liabilities: |  |  |  |
Debt | 4.3 | 8.3 |  |
Deferred income taxes | 68.6 | 100.1 |  |
Other liabilities | 5.7 | 4.7 |  |
Total long-term liabilities | 78.6 | 113.1 |  |
Total stockholders' equity | 2,763.9 |  |  |
Total stockholders' equity |  | 2,738.7 |  |
Total Liabilities and Stockholders' Equity | 5,069.0 | 4,798.1 |  |
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 49.5 | 32.4 | 30.3 | 37.9
Accounts receivable, net | 312.2 | 313.6 |  |
Merchandise inventory | 61.4 | 56.9 |  |
Miscellaneous receivables | 18.2 | 28.0 |  |
Prepaid expenses and other | 41.7 | 49.9 |  |
Total current assets | 483.0 | 480.8 |  |
Property and equipment, net | 22.5 | 22.6 |  |
Goodwill | 278.7 | 288.8 |  |
Other intangible assets, net | 168.1 | 192.4 |  |
Other assets | 2.1 | 2.6 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 954.4 | 987.2 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 169.1 | 165.0 |  |
Accounts payable-inventory financing | 12.3 | 16.1 |  |
Current maturities of long-term debt | 13.0 | 6.8 |  |
Contract liabilities | 75.7 | 71.3 |  |
Accrued expenses and other current liabilities | 65.5 | 86.8 |  |
Total current liabilities | 335.6 | 346.0 |  |
Long-term liabilities: |  |  |  |
Debt | 58.9 | 67.5 |  |
Deferred income taxes | 27.8 | 31.4 |  |
Other liabilities | 180.7 | 214.9 |  |
Total long-term liabilities | 267.4 | 313.8 |  |
Total stockholders' equity | 351.4 |  |  |
Total stockholders' equity |  | 327.4 |  |
Total Liabilities and Stockholders' Equity | 954.4 | 987.2 |  |
Co-Issuer | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | $ 0.0 | $ 0.0
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 0.0 | 0.0 |  |
Prepaid expenses and other | 0.0 | 0.0 |  |
Total current assets | 0.0 | 0.0 |  |
Property and equipment, net | 0.0 | 0.0 |  |
Goodwill | 0.0 | 0.0 |  |
Other intangible assets, net | 0.0 | 0.0 |  |
Other assets | 0.0 | 0.0 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 0.0 | 0.0 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 0.0 | 0.0 |  |
Accounts payable-inventory financing | 0.0 | 0.0 |  |
Current maturities of long-term debt | 0.0 | 0.0 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 0.0 | 0.0 |  |
Total current liabilities | 0.0 | 0.0 |  |
Long-term liabilities: |  |  |  |
Debt | 0.0 | 0.0 |  |
Deferred income taxes | 0.0 | 0.0 |  |
Other liabilities | 0.0 | 0.0 |  |
Total long-term liabilities | 0.0 | 0.0 |  |
Total stockholders' equity | 0.0 |  |  |
Total stockholders' equity |  | 0.0 |  |
Total Liabilities and Stockholders' Equity | $ 0.0 | $ 0.0 |  |

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