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Discontinued Operations (Tables)
9 Months Ended
Sep. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]  
Special Charge Liabilities
The following table details liabilities related to the exit costs of the sold businesses that remain as of September 30, 2021 (in millions):
 Accrued exit costs
Balance January 1, 2021$2.8 
Charged to expense 0.3 
Paid or otherwise settled(0.5)
Balance September 30, 2021$2.6 

The following table details liabilities related to the exit costs of the sold businesses that remained for 2020 (in millions):
 Accrued exit costs
Balance January 1, 2020$2.8 
Charged to expense 0.4 
Paid or otherwise settled(0.4)
Balance December 31, 2020$2.8