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Lease Obligations - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |
Finance leases, assets, gross | $ 638.6 |  | $ 638.6 |  | $ 563.0
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Property and equipment, net |  | Property and equipment, net |  | Property and equipment, net
Finance leases, assets, net | $ 463.2 |  | $ 463.2 |  | $ 418.7
Finance leases, assets, depreciation | 21.1 | $ 17.5 | 58.8 | $ 50.1 |
Operating leases, additions | 3.9 | 3.3 | 89.2 | 16.6 |
Operating leases, expense | 26.1 | 25.6 | 81.6 | 87.7 |
Operating leases, variable lease costs | 2.4 | 2.3 | 7.5 | 8.0 |
Operating leases, short-term leases, expense | $ 158.3 | $ 74.0 | $ 399.2 | $ 224.4 |
Finance leases, weighted average remaining lease term (in years) | 2 years 6 months |  | 2 years 6 months |  |
Finance leases, weighted average discount rate, percent | 3.40% |  | 3.40% |  |
Operating leases, weighted average remaining lease term (in years) | 3 years 9 months 18 days |  | 3 years 9 months 18 days |  |
Operating leases, weighted average discount rate, percent | 3.10% |  | 3.10% |  |
2021 Acquisitions |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating leases, additions |  |  | $ 74.6 |  |
Minimum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Operating leases, term of contract (in years) | 1 year |  | 1 year |  |
Minimum | Equipment Leases |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Leases, renewal term |  |  | 1 year |  |
Minimum | Facility Leases |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Leases, renewal term |  |  | 1 year |  |
Maximum |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Leases, remaining lease terms |  |  | 10 years |  |
Operating leases, term of contract (in years) | 1 year |  | 1 year |  |
Maximum | Equipment Leases |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Leases, renewal term |  |  | 5 years |  |
Maximum | Facility Leases |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Leases, renewal term |  |  | 5 years |  |

X
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- Definition Term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Indicates line item in statement of financial position that includes finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918631-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount, before accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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