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Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 221.0 | $ 144.2 | $ 251.7 | $ 263.7
Accounts receivable, net | 2,274.0 | 2,329.3 |  |
Merchandise inventory | 485.8 | 411.5 |  |
Miscellaneous receivables | 310.2 | 343.0 |  |
Prepaid expenses and other | 188.9 | 168.3 |  |
Total current assets | 3,479.9 | 3,396.3 |  |
Property and equipment, net | 153.1 | 161.1 |  |
Goodwill | 2,488.8 | 2,479.6 |  |
Other intangible assets, net | 859.0 | 897.0 |  |
Other assets | 47.1 | 32.7 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 7,027.9 | 6,966.7 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,288.5 | 1,317.7 |  |
Accounts payable-inventory financing | 523.7 | 498.0 |  |
Current maturities of long-term debt | 25.8 | 25.5 |  |
Contract liabilities | 193.6 | 158.8 |  |
Accrued expenses and other current liabilities | 550.9 | 522.1 |  |
Total current liabilities | 2,582.5 | 2,522.1 |  |
Long-term liabilities: |  |  |  |
Debt | 3,209.7 | 3,210.0 |  |
Deferred income taxes | 188.9 | 196.3 |  |
Other liabilities | 49.9 | 52.7 |  |
Total long-term liabilities | 3,448.5 | 3,459.0 |  |
Total stockholders' equity | 996.9 | 982.9 |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 7,027.9 | 6,966.7 |  |
Consolidating Adjustments |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | (18.2) | (1.9) | (23.6) | 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 | (18.2) | (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 | (216.9) | (211.6) |  |
Investment in and advances to subsidiaries | (4,012.1) | (4,050.0) |  |
Total Assets | (4,247.2) | (4,263.5) |  |
Current liabilities: |  |  |  |
Accounts payable-trade | (18.2) | (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 | (18.2) | (1.9) |  |
Long-term liabilities: |  |  |  |
Debt | 0.0 | 0.0 |  |
Deferred income taxes | (1.6) | (1.7) |  |
Other liabilities | (215.3) | (209.9) |  |
Total long-term liabilities | (216.9) | (211.6) |  |
Total stockholders' equity | (4,012.1) |  |  |
Total stockholders' equity |  | (4,050.0) |  |
Total Liabilities and Stockholders' Equity | (4,247.2) | (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 | 1.6 | 1.7 |  |
Investment in and advances to subsidiaries | 995.3 | 983.9 |  |
Total Assets | 996.9 | 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 | 996.9 |  |  |
Total stockholders' equity |  | 985.6 |  |
Total Liabilities and Stockholders' Equity | 996.9 | 985.6 |  |
Subsidiary Issuer | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 173.3 | 113.7 | 204.9 | 222.7
Accounts receivable, net | 0.0 | 0.0 |  |
Merchandise inventory | 0.0 | 0.0 |  |
Miscellaneous receivables | 105.2 | 103.9 |  |
Prepaid expenses and other | 21.5 | 18.0 |  |
Total current assets | 300.0 | 235.6 |  |
Property and equipment, net | 87.7 | 95.0 |  |
Goodwill | 751.8 | 751.8 |  |
Other intangible assets, net | 277.4 | 280.1 |  |
Other assets | 52.1 | 30.7 |  |
Investment in and advances to subsidiaries | 3,016.8 | 3,066.1 |  |
Total Assets | 4,485.8 | 4,459.3 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 24.6 | 42.5 |  |
Accounts payable-inventory financing | 0.0 | 1.0 |  |
Current maturities of long-term debt | 14.9 | 14.9 |  |
Contract liabilities | 0.0 | 0.0 |  |
Accrued expenses and other current liabilities | 210.6 | 173.3 |  |
Total current liabilities | 250.1 | 231.7 |  |
Long-term liabilities: |  |  |  |
Debt | 3,131.2 | 3,134.2 |  |
Deferred income taxes | 69.0 | 66.5 |  |
Other liabilities | 40.2 | 43.0 |  |
Total long-term liabilities | 3,240.4 | 3,243.7 |  |
Total stockholders' equity | 995.3 |  |  |
Total stockholders' equity |  | 983.9 |  |
Total Liabilities and Stockholders' Equity | 4,485.8 | 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 | 1,898.8 | 2,015.7 |  |
Merchandise inventory | 401.0 | 354.6 |  |
Miscellaneous receivables | 182.7 | 211.1 |  |
Prepaid expenses and other | 119.9 | 100.4 |  |
Total current assets | 2,602.4 | 2,681.8 |  |
Property and equipment, net | 42.1 | 43.5 |  |
Goodwill | 1,439.0 | 1,439.0 |  |
Other intangible assets, net | 388.6 | 424.5 |  |
Other assets | 207.5 | 209.3 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 4,679.6 | 4,798.1 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 1,063.6 | 1,112.1 |  |
Accounts payable-inventory financing | 481.8 | 480.9 |  |
Current maturities of long-term debt | 3.8 | 3.8 |  |
Contract liabilities | 100.4 | 87.5 |  |
Accrued expenses and other current liabilities | 263.4 | 262.0 |  |
Total current liabilities | 1,913.0 | 1,946.3 |  |
Long-term liabilities: |  |  |  |
Debt | 8.3 | 8.3 |  |
Deferred income taxes | 89.3 | 100.1 |  |
Other liabilities | 4.9 | 4.7 |  |
Total long-term liabilities | 102.5 | 113.1 |  |
Total stockholders' equity | 2,664.1 |  |  |
Total stockholders' equity |  | 2,738.7 |  |
Total Liabilities and Stockholders' Equity | 4,679.6 | 4,798.1 |  |
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 65.9 | 32.4 | 70.4 | 37.9
Accounts receivable, net | 375.2 | 313.6 |  |
Merchandise inventory | 84.8 | 56.9 |  |
Miscellaneous receivables | 22.3 | 28.0 |  |
Prepaid expenses and other | 47.5 | 49.9 |  |
Total current assets | 595.7 | 480.8 |  |
Property and equipment, net | 23.3 | 22.6 |  |
Goodwill | 298.0 | 288.8 |  |
Other intangible assets, net | 193.0 | 192.4 |  |
Other assets | 2.8 | 2.6 |  |
Investment in and advances to subsidiaries | 0.0 | 0.0 |  |
Total Assets | 1,112.8 | 987.2 |  |
Current liabilities: |  |  |  |
Accounts payable-trade | 218.5 | 165.0 |  |
Accounts payable-inventory financing | 41.9 | 16.1 |  |
Current maturities of long-term debt | 7.1 | 6.8 |  |
Contract liabilities | 93.2 | 71.3 |  |
Accrued expenses and other current liabilities | 76.9 | 86.8 |  |
Total current liabilities | 437.6 | 346.0 |  |
Long-term liabilities: |  |  |  |
Debt | 70.2 | 67.5 |  |
Deferred income taxes | 32.2 | 31.4 |  |
Other liabilities | 220.1 | 214.9 |  |
Total long-term liabilities | 322.5 | 313.8 |  |
Total stockholders' equity | 352.7 |  |  |
Total stockholders' equity |  | 327.4 |  |
Total Liabilities and Stockholders' Equity | 1,112.8 | 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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