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Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Allowance for trade receivables, beginning balance $ 26.3 $ 22.4
Additions — charged (credited) to expense 8.2 3.6
Transfer from (to) allowance for credit losses (2.9) 3.4
Net recoveries, write-offs and other (3.7) (3.1)
Allowance for trade receivables, ending balance 27.9 26.3
Long term customer receivables 103.5 123.1
Allowance for long term customer receivables [Roll Forward]    
Allowance for long term customer receivables, beginning 61.1 60.5
Additions — charged (credited) to expense (3.5) 17.6
Transfer from (to) allowance for doubtful accounts 2.9 (3.4)
Foreign currency adjustments (7.6) (0.5)
Net recoveries, write-offs and other (28.2) (13.1)
Allowance for long term customer receivables, ending $ 24.7 $ 61.1