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Leases - Lease Expense and Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |
Operating lease costs | $ 74.1 | $ 70.4
Finance lease costs: |  |
Amortization of leased assets | 26.2 | 22.2
Interest on lease liabilities | 22.2 | 13.0
Total finance lease costs | 48.4 | 35.2
Variable and short-term lease costs | 16.9 | 13.2
Total lease costs | 139.4 | 118.8
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash outflows from operating leases | 68.1 | 67.3
Operating cash outflows from finance leases | 20.7 | 13.0
Financing cash outflows from finance leases | 18.3 | 13.4
Right-of-use assets obtained in exchange for lease obligations: |  |
Operating leases | 62.1 | 56.2
Finance leases | 47.0 | 133.3
Noncontrolling Interest |  |
Finance lease costs: |  |
Rent paid under finance lease agreement, allocated to principal and interest | 6.9 | 6.7
Investor |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease costs | $ 22.8 | $ 20.6

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- Definition Amount of interest expense on finance lease liability. + 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 (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: 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=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: 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=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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