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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Leases [Abstract] |  |
2020 | $ 430.3 |
2021 | 377.1 |
2022 | 315.4 |
2023 | 248.5 |
2024 | 187.9 |
Thereafter | 401.9 |
Total lease payments | 1,961.1 |
Amount representing interest | (218.8) |
Present value of operating lease liabilities | 1,742.3 |
Proceeds from real estate financing transactions | 7.2 | $ 225.3
Transactions related to future obligations | $ 212.4 |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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