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Leases - The Company as Lessee - Other amounts Relating to Finance and Operating Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash outflows from operating leases $ 4.6 $ 5.3
Operating cash outflows from financing leases 0.1 0.1
Financing cash flows from finance leases $ 1.2 $ 0.6
Weighted-average remaining lease term (years) - operating leases 9 years 1 month 6 days 9 years 3 months 18 days
Weighted-average remaining lease term (years) - finance leases 2 years 10 months 24 days 3 years 3 months 18 days
Weighted-average discount rate - operating leases (percent) 4.40% 4.40%
Weighted-average discount rate - finance leases (percent) 3.20% 3.10%