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Additional Financial Information (Accounts Receivable Monetization) (Details) - Trade Accounts Receivable - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Individual Monetization Agreements |  |  |
Transfer of Financial Assets Accounted for as Sales [Line Items] |  |  |
Net cash proceeds received |  | $ 1,593.9 | $ 469.2
Carrying value of receivables transferred and derecognized |  | 1,603.2 | 473.9
Loss recorded related to transfers of receivables |  | 9.3 | 4.7
Derecognized accounts receivable for which the Company continues to service, amount outstanding |  | 529.8 | $ 350.6
Pooled Monetization Agreements |  |  |
Transfer of Financial Assets Accounted for as Sales [Line Items] |  |  |
Gross cash proceeds received for receivables transferred and derecognized |  | 192.6 |
Less amounts from collections reinvested under revolving agreement |  | (84.5) |
Proceeds from new transfers |  | 108.1 |
Collections not reinvested and remitted or to be remitted |  | (15.6) |
Net cash proceeds received |  | 92.5 |
Carrying value of receivables transferred and derecognized |  | 191.9 |
Obligations recorded |  | 2.5 |
Loss recorded related to transfers of receivables |  | 1.7 |
Derecognized accounts receivable for which the Company continues to service, amount outstanding |  | 92.5 |
Revolving agreement, maximum amount of receivables allowed to transfer | $ 150.0 |  |
Accounts receivable pledged as collateral under pooled monetization agreement |  | $ 56.3 |

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