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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Apr. 01, 2018 | Mar. 31, 2018
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Accounts receivable, net - current |  | $ 833.1 |  | $ 833.1 |  | $ 1,042.2 |  | $ 946.0
Accounts receivable, net - non-current |  | 228.7 | [1] | 228.7 | [1] | 257.7 | [1] | 325.2
Contract asset - current | [2] | 69.0 |  | 69.0 |  | 78.3 |  |
Contract asset - non-current | [3] | 28.0 |  | 28.0 |  | 71.5 |  |
Deferred revenue - current |  | 173.0 |  | 173.0 |  | 183.8 |  | $ 183.9
Deferred revenue - non-current |  | 70.0 |  | 70.0 |  | $ 70.5 |  |
Contract with Customer, Liability, Revenue Recognized |  | $ 23.6 |  | 128.8 |  |  |  |
Accounts receivable, current |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Asset, Increase (Decrease) |  |  |  | (209.1) |  |  |  |
Accounts receivable, noncurrent |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Asset, Increase (Decrease) | [1] |  |  | (29.0) |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Asset, Increase (Decrease) | [2] |  |  | (9.3) |  |  |  |
Other Non-Current Assets |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Asset, Increase (Decrease) | [3] |  |  | (43.5) |  |  |  |
Deferred revenue, current |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Liability, Increase (Decrease) |  |  |  | (10.8) |  |  |  |
Deferred revenue, noncurrent |  |  |  |  |  |  |  |
Contract with Customer, Schedule of Asset and Liability [Line Items] |  |  |  |  |  |  |  |
Contract with Customer, Liability, Increase (Decrease) |  |  |  | $ (0.5) |  |  |  |
[1] | Included in accounts receivable within non-current other assets in the unaudited condensed consolidated balance sheets.
[2] | Included in prepaid expenses and other within other current assets in the unaudited condensed consolidated balance sheets.
[3] | Included in prepaid expenses and other within non-current other assets in the unaudited condensed consolidated balance sheets.

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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