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Additional Financial Information (Accounts Receivable Monetization) (Details) - Trade Accounts Receivable - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Individual Monetization Agreements            
Transfer of Financial Assets Accounted for as Sales [Line Items]            
Net cash proceeds received or (paid or to be paid)   $ 334.2 $ 351.5 $ 1,077.6 $ 1,004.3  
Carrying value of receivables transferred and derecognized   336.2 353.2 1,083.9 1,008.3  
Loss (gain) recorded related to transfers of receivables   2.1 1.7 6.2 3.9  
Derecognized accounts receivable for which the Company continues to service, amount outstanding   463.7   463.7   $ 562.8
Pooled Monetization Agreements            
Transfer of Financial Assets Accounted for as Sales [Line Items]            
Gross cash proceeds received for receivables transferred and derecognized   20.4 40.8 111.8 126.8  
Less amounts from collections reinvested under revolving agreement   (12.1) (32.5) (76.0) (107.4)  
Proceeds from new transfers   8.3 8.3 35.8 19.4  
Collections not reinvested and remitted or to be remitted   (10.8) (11.5) (44.4) (25.8)  
Net cash proceeds received or (paid or to be paid)   (2.5) (3.2) (8.6) (6.4)  
Carrying value of receivables transferred and derecognized   20.3 40.4 110.9 126.0  
Obligations recorded   0.0 0.7 0.9 1.4  
Loss (gain) recorded related to transfers of receivables   (0.1) $ 0.3 0.0 $ 0.5  
Purchases of receivables previously transferred   25.5   25.5    
Derecognized accounts receivable for which the Company continues to service, amount outstanding   64.9   64.9   $ 99.0
Revolving agreement, maximum amount of receivables allowed to transfer $ 150.0          
Accounts receivable pledged as collateral under pooled monetization agreement   $ 52.0   $ 52.0