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Discontinued Operations - Special Charges Liabilities (Details) - Lease Liabilities and Other Exit Costs - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Restructuring Reserve [Roll Forward]    
Beginning Balance $ 2.8 $ 2.8
Charged to expense 0.3 0.4
Paid or otherwise settled (0.5) (0.4)
Ending Balance $ 2.6 $ 2.8