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Accounts Receivable - Allowance for Credit Losses for Accounts Receivable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Credit Loss        
Beginning balance $ 35.5 $ 39.4 $ 27.8  
Charges to provision for credit losses 63.7 25.9 25.1  
Write-off of uncollectible receivables (53.7) (32.2) (16.2)  
Recoveries of credit losses 1.0 2.4 2.9  
Translation adjustments (0.3) 0.0 (0.1)  
Ending balance 57.3 35.5 39.4  
Cumulative transition adjustment to retained earnings 1,912.9 1,893.9 1,831.6 $ 1,738.0
Retained Earnings        
Allowance for Credit Loss        
Cumulative transition adjustment to retained earnings 1,836.7 1,761.3 $ 1,606.1 $ 1,492.8
Cumulative Effect, Period of Adoption, Adjustment        
Allowance for Credit Loss        
Cumulative transition adjustment to retained earnings   (11.1)    
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings        
Allowance for Credit Loss        
Cumulative transition adjustment to retained earnings   (11.1)    
Cumulative Effect, Period of Adoption, Adjusted Balance        
Allowance for Credit Loss        
Beginning balance $ 46.6      
Ending balance   $ 46.6