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Leases - Other Information Related to Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
2020    
Weighted-average remaining lease term (years) - finance leases 5 years 7 months 6 days 5 years 7 months 6 days
Weighted-average discount rate - finance leases 3.30% 3.20%
2020    
Weighted-average remaining lease term (years) - operating leases 6 years 7 months 6 days 6 years 6 months
Weighted-average discount rate - operating leases 5.60% 5.90%
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from finance leases $ 0.6 $ 0.5
Operating cash flows from operating leases 49.9 52.9
Cash paid for amounts included in the measurement of lease liabilities:    
Financing cash flows from finance leases 4.3 4.0
Right of use assets obtained in exchange for new operating lease liability 38.9 30.2
Right of use assets obtained in exchange for new financing lease liability $ 4.1 $ 8.2