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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II - Valuation and Qualifying Accounts (in Millions)
Allowance for Doubtful Accounts and Revenue Adjustments for the Year Ended
 
Balance at Beginning of Year
 
Charged to Expense / Against Revenue
 
Write-offs-Net of Recoveries
 
Balance at
End of Year
December 31, 2017
 
$
3.5

 
$
3.7

 
$
(2.0
)
 
$
5.2

December 31, 2018
 
5.2

 
3.7

 
(2.1
)
 
6.8

December 31, 2019
 
6.8

 
(1.1
)
 
(2.3
)
 
3.4