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Long-Term Debt - Debt Balances and Interest Rates (Details) £ in Millions | Sep. 30, 2018 GBP (£) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal |  | $ 3,238,200,000 | $ 3,255,900,000 |
Long-term debt, current maturities, gross |  | (32,000,000.0) | (25,500,000) |
Long-term debt, excluding current maturities, gross |  | 3,206,200,000 | 3,230,400,000 |
Deferred finance costs, net |  | (18,800,000) | (20,400,000) |
Deferred finance costs, current, net |  | 0 | 0 |
Deferred financing costs, noncurrent, net |  | (18,800,000) | (20,400,000) |
Long-term debt, net of deferred financing costs |  | 3,219,400,000 | 3,235,500,000 |
Current maturities of long-term debt, net of Deferred financing costs |  | (32,000,000.0) | (25,500,000) |
Long-term debt, excluding current maturities, net of deferred financing costs |  | $ 3,187,400,000 | $ 3,210,000,000.0 |
Senior secured asset-based revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 0.00% | 0.00% | 0.00% |
Principal |  | $ 0 | $ 0 |
Deferred finance costs, net |  | 0 | 0 |
Long-term debt, net of deferred financing costs |  | $ 0 | $ 0 |
CDW UK revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.10% | 2.10% | 0.00% |
Principal |  | $ 6,500,000 | $ 0 |
Deferred finance costs, net |  | 0 | 0 |
Long-term debt, net of deferred financing costs |  | $ 6,500,000 | $ 0 |
Senior secured term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 3.80% | 3.80% | 3.70% |
Principal |  | $ 1,456,900,000 | $ 1,468,000,000.0 | $ 1,500,000,000
Deferred finance costs, net |  | (2,700,000) | (2,000,000.0) |
Long-term debt, net of deferred financing costs |  | $ 1,454,200,000 | $ 1,466,000,000.0 |
CDW UK term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 2.29% | 2.29% | 1.90% |
Principal | £ 51 | $ 66,000,000 | $ 75,700,000 |
Deferred finance costs, net |  | (1,100,000) | (1,400,000) |
Long-term debt, net of deferred financing costs |  | $ 65,400,000 | $ 74,300,000 |
Senior notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 5.00% | 5.00% | 5.00% |
Principal |  | $ 525,000,000.0 | $ 525,000,000.0 |
Deferred finance costs, net |  | (3,800,000) | (4,500,000) |
Long-term debt, net of deferred financing costs |  | $ 521,200,000 | $ 520,500,000 |
Senior notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 5.50% | 5.50% | 5.50% |
Principal |  | $ 575,000,000.0 | $ 575,000,000.0 |
Deferred finance costs, net |  | (4,600,000) | (5,200,000) |
Long-term debt, net of deferred financing costs |  | $ 570,400,000 | $ 569,800,000 |
Senior notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate | 5.00% | 5.00% | 5.00% |
Principal |  | $ 600,000,000.0 | $ 600,000,000.0 |
Deferred finance costs, net |  | (6,600,000) | (7,300,000) |
Long-term debt, net of deferred financing costs |  | 593,400,000 | 592,700,000 |
Other long-term obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal |  | 8,300,000 | 12,200,000 |
Deferred finance costs, net |  | 0 | 0 |
Long-term debt, net of deferred financing costs |  | $ 8,300,000 | $ 12,200,000 |

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- Definition Amount of long-term debt, after unamortized deferred financing costs, discount, or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized deferred financing costs, discount, or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt, and other types of debt. + References No definition available. + Details
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