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Operating Leases - Schedule of Operating Lease Liability, Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Liability, Payments, Due prior year | $ 0.0 | $ 17.7
Liability, Payments, Next twelve months | 17.2 | 16.4
Liability, Payments, Due year two | 14.2 | 13.0
Liability, Payments, Due year three | 13.5 | 12.2
Liability, Payments, Due year four | 12.6 | 11.7
Liability, Payments, Due year five | 12.2 | 11.5
Liability, Payments, Due after year five | 63.4 | 62.1
Total minimum lease payments | 133.1 | 144.6
Less imputed interest | (27.1) | (31.4)
Operating lease liabilities | $ 106.0 | $ 113.2

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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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