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Long-Term Debt - Debt Balances and Interest Rates (Details) £ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Mar. 02, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 01, 2016 USD ($) | Aug. 01, 2016 GBP (£)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 3,255.9 |  |  | $ 3,267.8 |  |
Long-term debt, current maturities, gross | (25.5) |  |  | (18.5) |  |
Long-term debt, excluding current maturities, gross | 3,230.4 |  |  | 3,249.3 |  |
Deferred finance costs, net | (20.4) |  |  | (33.4) |  |
Deferred finance costs, current, net | 0.0 |  |  | 0.0 |  |
Deferred finance costs, noncurrent, net | (20.4) |  |  | (33.4) |  |
Long-term debt, net of deferred financing costs | 3,235.5 |  |  | 3,234.4 |  |
Current maturities of long-term debt, net of deferred financing costs | (25.5) |  |  | (18.5) |  |
Long-term debt, excluding current maturities, net of deferred financing costs | $ 3,210.0 |  |  | $ 3,215.9 |  |
Senior secured asset-based revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 0.00% | 0.00% |  | 0.00% |  |
Long-term debt | $ 0.0 |  |  | $ 0.0 |  |
Deferred finance costs, net | 0.0 |  |  | 0.0 |  |
Long-term debt, net of deferred financing costs | $ 0.0 |  |  | $ 0.0 |  |
CDW UK revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 0.00% | 0.00% |  | 0.00% |  |
Long-term debt | $ 0.0 | £ 0 |  | $ 0.0 |  |
Deferred finance costs, net | 0.0 |  |  | 0.0 |  |
Long-term debt, net of deferred financing costs | $ 0.0 |  |  | $ 0.0 |  |
Senior secured term loan facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 3.70% | 3.70% |  | 3.30% |  |
Long-term debt | $ 1,468.0 |  |  | $ 1,483.0 |  |
Deferred finance costs, net | (2.0) |  |  | (14.9) |  |
Long-term debt, net of deferred financing costs | $ 1,466.0 |  |  | $ 1,468.1 |  |
CDW UK term loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 1.92% | 1.92% |  | 1.80% |  |
Long-term debt | $ 75.7 |  |  | $ 69.1 | $ 76.0 | £ 56
Deferred finance costs, net | (1.4) |  |  | (1.6) |  |
Long-term debt, net of deferred financing costs | $ 74.3 |  |  | $ 67.5 |  |
Senior notes due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect |  |  |  | 6.00% |  |
Long-term debt |  |  | $ 600.0 | $ 600.0 |  |
Deferred finance costs, net |  |  |  | (5.6) |  |
Long-term debt, net of deferred financing costs |  |  |  | $ 594.4 |  |
Senior notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 5.00% | 5.00% |  | 5.00% |  |
Long-term debt | $ 525.0 |  |  | $ 525.0 |  |
Deferred finance costs, net | (4.5) |  |  | (5.3) |  |
Long-term debt, net of deferred financing costs | $ 520.5 |  |  | $ 519.7 |  |
Senior notes due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 5.50% | 5.50% |  | 5.50% |  |
Long-term debt | $ 575.0 |  |  | $ 575.0 |  |
Deferred finance costs, net | (5.2) |  |  | (6.0) |  |
Long-term debt, net of deferred financing costs | $ 569.8 |  |  | 569.0 |  |
Senior notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate in effect | 5.00% | 5.00% |  |  |  |
Long-term debt | $ 600.0 |  | $ 600.0 |  |  |
Deferred finance costs, net | (7.3) |  |  |  |  |
Long-term debt, net of deferred financing costs | 592.7 |  |  |  |  |
Other long-term obligations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 12.2 |  |  | 15.7 |  |
Deferred finance costs, net | 0.0 |  |  | 0.0 |  |
Long-term debt, net of deferred financing costs | $ 12.2 |  |  | $ 15.7 |  |

X
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