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Receivables - Allowance for Doubtful Trade Receivables and Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Allowance for short term receivables [Roll Forward]    
Beginning balance $ 27.9 $ 26.3
Additions - charged to expense 4.7 8.2
Transfer from (to) allowance for credit losses (see below) 0.1 (2.9)
Net recoveries, write-offs and other (1.1) (3.7)
Ending balance 31.6 27.9
Allowance for long term customer receivables [Roll Forward]    
Beginning balance 24.7 61.1
Additions - charged to expense 2.0 (3.5)
Transfer from (to) allowance for doubtful accounts (see above) (0.1) 2.9
Foreign currency adjustments (0.7) (7.6)
Net recoveries, write-offs and other   (28.2)
Ending balance $ 25.9 $ 24.7