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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |  |
Accounts receivable, net - current | $ 522.0 | $ 647.2
Accounts receivable, net - current, addition (reduction) | (125.2) |
Accounts receivable, net - non-current | 53.6 | 176.1
Accounts receivable, net - non-current, addition (reduction) | (122.5) |
Contract asset - current | 18.8 | 97.3
Contract asset - current, addition (reduction) | (78.5) |
Contract asset - non-current | 10.5 | 72.1
Contract asset - non-current, addition (reduction) | (61.6) |
Deferred revenue - current | 116.6 | 146.5
Deferred revenue - current, addition (reduction) | (29.9) |
Deferred revenue - non-current | 61.3 | $ 62.8
Deferred revenue - non-current, addition (reduction) | $ (1.5) |

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