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Receivables - Allowance for Doubtful Trade Receivables and Credit Losses (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Allowance for short term receivables [Roll Forward]    
Beginning balance $ 27.9 $ 26.3
Additions - charged to expense 4.0 8.2
Transfer from (to) allowance for credit losses (see below) (0.5) (2.9)
Net recoveries, write-offs and other 1.2 (3.7)
Ending balance 32.6 27.9
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 24.7 61.1
Additions - charged to expense 4.8 (3.5)
Transfer from (to) allowance for doubtful accounts (see above) 0.5 2.9
Foreign currency adjustments 0.0 (7.6)
Net recoveries, write-offs and other   (28.2)
Ending balance $ 30.0 $ 24.7