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Long-Term Debt - Debt Balances and Interest Rates (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Aug. 13, 2020 | Dec. 31, 2019 | Sep. 26, 2019
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 3,954.4 |  | $ 3,337.9 |
Deferred finance costs, net | (27.2) |  | (20.6) |
Long-term debt, current maturities, gross | (70.9) |  | (34.1) |
Long-term debt, excluding current maturities, net of deferred financing costs | $ 3,856.3 |  | $ 3,283.2 |
CDW UK revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 0.00% |  | 0.00% |
Long-term debt | $ 0.0 |  | $ 0.0 |
Senior secured asset-based revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 0.00% |  | 5.00% |
Long-term debt | $ 0.0 |  | $ 51.0 |
Senior secured asset-based revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0.0 |  | $ 51.0 |
CDW UK term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 1.445% |  | 2.19% |
Long-term debt | $ 56.0 |  | $ 61.0 |
Senior secured term loan facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 1.90% |  | 3.55% |
Long-term debt | $ 1,423.4 |  | $ 1,438.3 |
Total term loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 1,479.4 |  | $ 1,499.3 |
Senior Notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  |  |  | $ 525.0
Senior notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 5.50% |  | 5.50% |
Long-term debt | $ 575.0 |  | $ 575.0 |
Senior Notes due May 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 4.125% |  | 0.00% |
Long-term debt | $ 600.0 |  | $ 0.0 |
Senior Notes due September 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 0.00% |  | 5.00% |
Long-term debt | $ 0.0 | $ 600.0 | $ 600.0 |
Senior notes due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 4.25% |  | 4.25% |
Long-term debt | $ 600.0 |  | $ 600.0 |
Senior Notes due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate in effect | 3.25% |  | 0.00% |
Long-term debt | $ 700.0 |  | $ 0.0 |
Total unsecured senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 2,475.0 |  | 1,775.0 |
Other long-term obligations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 0.0 |  | $ 12.6 |

X
- 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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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