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Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Commitment and Contingent Liabilities              
2021 $ 5.0   $ 5.0   $ 4.8    
2022 2.8   2.8   5.0    
2023 2.8   2.8   2.8    
2024 4.2   4.2   2.8    
2025 and thereafter         4.4    
Aggregate minimum rental commitments 16.1   16.1   19.8    
Rental expense 1.3 $ 0.9 3.4 $ 2.8 3.8 $ 3.0 $ 1.5
Property Lease Guarantee [Member]              
Loss Contingencies [Line Items]              
Guarantees $ 0.2   $ 0.2   $ 0.6 $ 0.6 $ 0.5