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Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 100.7 | $ 144.2 | $ 79.0 | $ 263.7
Accounts receivable, net | 2,612.2 | 2,329.3 |  |
Merchandise inventory | 576.9 | 411.5 |  |
Miscellaneous receivables | 373.8 | 343.0 |  |
Prepaid expenses and other | 181.1 | 168.3 |  |
Total current assets | 3,844.7 | 3,396.3 |  |
Property and equipment, net | 150.3 | 161.1 |  |
Goodwill | 2,472.5 | 2,479.6 |  |
Other intangible assets, net | 802.3 | 897.0 |  |
Other assets | 60.3 | 32.7 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 7,330.1 | 6,966.7 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,693.6 | 1,317.7 |  |
Accounts payable-inventory financing | 387.6 | 498.0 |  |
Current maturities of long-term debt | 38.6 | 25.5 |  |
Contract liabilities | 169.9 | 158.8 |  |
Accrued expenses and other current liabilities | 530.3 | 522.1 |  |
Total current liabilities | 2,820.0 | 2,522.1 |  |
Long-term liabilities: |  |  |  |
Debt | 3,201.7 | 3,210.0 |  |
Deferred income taxes | 172.9 | 196.3 |  |
Other liabilities | 66.6 | 52.7 |  |
Total long-term liabilities | 3,441.2 | 3,459.0 |  |
Total stockholders' equity | 1,068.9 | 982.9 |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 7,330.1 | 6,966.7 |  |
Consolidating Adjustments |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | (22.6) | (1.9) | (26.5) | 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 | (22.6) | (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 | (171.2) | (211.6) |  |
Investment in and advances to subsidiaries | (4,226.0) | (4,050.0) |  |
Total Assets | (4,419.8) | (4,263.5) |  |
Current liabilities: |  |  |  |
Accounts payable-trade | (22.6) | (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 | (22.6) | (1.9) |  |
Long-term liabilities: |  |  |  |
Debt | 0.0 | 0.0 |  |
Deferred income taxes | (1.5) | (1.7) |  |
Other liabilities | (169.7) | (209.9) |  |
Total long-term liabilities | (171.2) | (211.6) |  |
Total stockholders' equity | (4,226.0) |  |  |
Total stockholders' equity |  | (4,050.0) |  |
Total Liabilities and Stockholders' Equity | (4,419.8) | (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 | 1.5 | 1.7 |  |
Investment in and advances to subsidiaries | 1,067.4 | 983.9 |  |
Total Assets | 1,068.9 | 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 | 1,068.9 |  |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 1,068.9 | 985.6 |  |
Subsidiary Issuer | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 70.9 | 113.7 | 67.0 | 222.7
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 114.5 | 103.9 |  |
Prepaid expenses and other | 20.4 | 18.0 |  |
Total current assets | 205.8 | 235.6 |  |
Property and equipment, net | 85.9 | 95.0 |  |
Goodwill | 751.8 | 751.8 |  |
Other intangible assets, net | 273.6 | 280.1 |  |
Other assets | 69.6 | 30.7 |  |
Investment in and advances to subsidiaries | 3,158.6 | 3,066.1 |  |
Total Assets | 4,545.3 | 4,459.3 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 31.9 | 42.5 |  |
Accounts payable-inventory financing | 0.1 | 1.0 |  |
Current maturities of long-term debt | 14.9 | 14.9 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 186.6 | 173.3 |  |
Total current liabilities | 233.5 | 231.7 |  |
Long-term liabilities: |  |  |  |
Debt | 3,127.2 | 3,134.2 |  |
Deferred income taxes | 67.6 | 66.5 |  |
Other liabilities | 49.6 | 43.0 |  |
Total long-term liabilities | 3,244.4 | 3,243.7 |  |
Total stockholders' equity | 1,067.4 |  |  |
Total stockholders' equity |  | 983.9 |  |
Total Liabilities and Stockholders' Equity | 4,545.3 | 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 | 2,263.8 | 2,015.7 |  |
Merchandise inventory | 502.2 | 354.6 |  |
Miscellaneous receivables | 244.1 | 211.1 |  |
Prepaid expenses and other | 120.6 | 100.4 |  |
Total current assets | 3,130.7 | 2,681.8 |  |
Property and equipment, net | 40.7 | 43.5 |  |
Goodwill | 1,439.0 | 1,439.0 |  |
Other intangible assets, net | 353.1 | 424.5 |  |
Other assets | 159.2 | 209.3 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 5,122.7 | 4,798.1 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,460.9 | 1,112.1 |  |
Accounts payable-inventory financing | 380.1 | 480.9 |  |
Current maturities of long-term debt | 3.8 | 3.8 |  |
Contract liabilities | 87.4 | 87.5 |  |
Accrued expenses and other current liabilities | 276.6 | 262.0 |  |
Total current liabilities | 2,208.8 | 1,946.3 |  |
Long-term liabilities: |  |  |  |
Debt | 8.3 | 8.3 |  |
Deferred income taxes | 78.3 | 100.1 |  |
Other liabilities | 4.3 | 4.7 |  |
Total long-term liabilities | 90.9 | 113.1 |  |
Total stockholders' equity | 2,823.0 |  |  |
Total stockholders' equity |  | 2,738.7 |  |
Total Liabilities and Stockholders' Equity | 5,122.7 | 4,798.1 |  |
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 52.4 | 32.4 | 38.5 | 37.9
Accounts receivable, net | 348.4 | 313.6 |  |
Merchandise inventory | 74.7 | 56.9 |  |
Miscellaneous receivables | 15.2 | 28.0 |  |
Prepaid expenses and other | 40.1 | 49.9 |  |
Total current assets | 530.8 | 480.8 |  |
Property and equipment, net | 23.7 | 22.6 |  |
Goodwill | 281.7 | 288.8 |  |
Other intangible assets, net | 175.6 | 192.4 |  |
Other assets | 1.2 | 2.6 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 1,013.0 | 987.2 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 223.4 | 165.0 |  |
Accounts payable-inventory financing | 7.4 | 16.1 |  |
Current maturities of long-term debt | 19.9 | 6.8 |  |
Contract liabilities | 82.5 | 71.3 |  |
Accrued expenses and other current liabilities | 67.1 | 86.8 |  |
Total current liabilities | 400.3 | 346.0 |  |
Long-term liabilities: |  |  |  |
Debt | 66.2 | 67.5 |  |
Deferred income taxes | 28.5 | 31.4 |  |
Other liabilities | 182.4 | 214.9 |  |
Total long-term liabilities | 277.1 | 313.8 |  |
Total stockholders' equity | 335.6 |  |  |
Total stockholders' equity |  | 327.4 |  |
Total Liabilities and Stockholders' Equity | 1,013.0 | 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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