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Debt - Senior Secured Notes (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | May 31, 2018 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs, net | $ 67,900,000 | $ 83,600,000 |  | $ 33,700,000
Debt instrument, unamortized discount | $ 1,043,200,000 | 1,268,700,000 |  |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs, net |  |  | $ 24,400,000 |
Debt instrument, unamortized discount |  |  | 10,500,000 |
Debt instrument, redemption price, percentage | 101.00% |  |  |
Senior Notes | 2021 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 1,000,000,000.00 |
Debt instrument, interest rate, stated percentage | 3.922% |  | 3.922% |
Debt issuance costs, net | $ 4,800,000 | 8,800,000 |  |
Debt instrument, unamortized discount | $ 2,100,000 | 3,800,000 |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Senior Notes | 2023 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, face amount |  |  | $ 1,000,000,000.00 |
Debt instrument, interest rate, stated percentage | 4.333% |  | 4.333% |
Debt issuance costs, net | $ 7,700,000 | 10,200,000 |  |
Debt instrument, unamortized discount | $ 3,500,000 | $ 4,400,000 |  |
Senior Notes | 2023 Notes | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Senior Notes | 2023 Notes | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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