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Debt - Debt Balances and Interest Rates (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Debt Instrument [Line Items] |  |
Long-term debt | $ 4,089.9 | $ 3,954.4
Unamortized deferred financing fees | (23.7) | (27.2)
Current maturities of long-term debt | (28.5) | (70.9)
Total long-term debt | 4,037.7 | 3,856.3
Senior secured asset-based revolving credit facility |  |
Debt Instrument [Line Items] |  |
Long-term debt | 165.9 | 0.0
Total term loans |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,412.2 | $ 1,479.4
CDW UK term loan |  |
Debt Instrument [Line Items] |  |
Interest rate in effect | 0.00% | 1.445%
Long-term debt | $ 0.0 | $ 56.0
Senior secured term loan facility |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,412.2 | 1,423.4
Total unsecured senior notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,475.0 | $ 2,475.0
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 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate in effect | 4.125% | 4.125%
Long-term debt | $ 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% | 3.25%
Long-term debt | $ 700.0 | $ 700.0
Other long-term obligations |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 36.8 | $ 0.0

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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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- Definition Carrying amount of long-term debt, net of unamortized deferred financing costs, discount, or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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, 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=123466204&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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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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