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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Account
SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS
Years Ended December 31, 2021, 2020, and 2019

Allowance for Doubtful Accounts (in millions)
Balance at
Beginning
of Year
Charged to Cost and
Expense (1)
Accounts
Written Off		Balance at
End of Year
Year Ended December 31, 2021
Allowance for Doubtful Accounts$1.6 (0.2)(1.2)$0.2 
Year Ended December 31, 2020
Allowance for Doubtful Accounts$0.8 0.8 — $1.6 
Year Ended December 31, 2019
Allowance for Doubtful Accounts$0.6 0.3 (0.1)$0.8 
(1) Net of recoveries on previously reserved or written-off balances.