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Leases (Lease Expense and Cash Outflows from Operating and Finance Leases) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Finance lease expense: |  |
Depreciation and amortization | $ 19.8 | $ 21.7
Interest expense | 8.6 | 8.1
Total finance lease expense | 28.4 | 29.8
Operating lease expense | 64.6 | 35.8
Short-term lease expense | 2.2 | 1.8
Variable lease expense | 1.5 | 1.3
Total lease expense | 96.7 | 68.7
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash outflows from operating leases | 80.4 | 38.9
Operating cash outflows from finance leases | 8.6 | 8.1
Financing cash outflows from finance leases | 18.3 | 39.2
Total cash outflows from operating and finance leases | $ 107.3 | $ 86.2

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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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