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Leases - Lease Obligations (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Leases [Abstract] |  |  |
Finance leases - ROU assets | $ 57.6 | $ 54.8 |
Finance leases - Accumulated depreciation | (17.5) | (15.0) |
Operating leases - ROU assets | 113.9 | 118.8 |
Operating leases - Accumulated depreciation | (32.1) | (28.7) |
Total lease assets | 121.9 | 129.9 |
Finance leases |  | (10.4) | $ (11.8)
Operating leases | (24.1) | (26.2) |
Finance leases |  | (28.7) | $ (27.4)
Operating leases | (59.9) | (65.7) |
Total lease liabilities | $ (123.2) | $ (131.0) |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + 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 (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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