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Operating Leases - Schedule of Operating Lease Liability, Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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