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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Mar. 31, 2019
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Accounts receivable, net - current |  | $ 664.2 | $ 664.2 | $ 647.2
Accounts receivable, net - non-current |  | 148.6 | 148.6 | 176.1
Contract asset - current | [1] | 16.6 | 16.6 | 97.3
Contract asset - non-current | [1] | 14.0 | 14.0 | 72.1
Deferred revenue - current |  | 117.3 | 117.3 | 146.5
Deferred revenue - non-current |  | 67.3 | 67.3 | $ 62.8
Contract with Customer, Liability, Revenue Recognized |  | $ 32.4 | 99.8 |
Accounts receivable, current |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Asset, Increase (Decrease) |  |  | 17.0 |
Accounts receivable, noncurrent |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Asset, Increase (Decrease) |  |  | (27.5) |
Other Current Assets |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Asset, Increase (Decrease) | [1] |  | (80.7) |
Other Non-Current Assets |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Asset, Increase (Decrease) | [1] |  | (58.1) |
Deferred revenue, current |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Liability, Increase (Decrease) |  |  | (29.2) |
Deferred revenue, noncurrent |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Liability, Increase (Decrease) |  |  | $ 4.5 |
[1] | Included in prepaid expenses and other.

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