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Debt and Credit Facility - Senior Secured Notes (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | $ 96,500,000 | $ 24,400,000 | $ 40,100,000 | $ 33,700,000
Debt instrument, unamortized discount | $ 1,298,000,000 | 10,500,000 | 1,372,900,000 |
2021 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,000,000,000.00 |  |
Coupon Interest Rate | 3.922% | 3.922% |  |
Debt issuance costs | $ 9,800,000 |  | 0 |
Debt instrument, unamortized discount | $ 4,300,000 |  | 0 |
Effective Interest Rate |  | 3.922% |  |
Debt Instrument, redemption price, percentage | 100.00% |  |  |
2023 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,000,000,000.00 |  |
Coupon Interest Rate | 4.333% | 4.333% |  |
Debt issuance costs | $ 10,800,000 |  | 0 |
Debt instrument, unamortized discount | $ 4,700,000 |  | $ 0 |
Effective Interest Rate |  | 4.333% |  |
2023 Senior Secured Notes | Debt instrument, redemption, period one |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, redemption price, percentage | 100.00% |  |  |
2023 Senior Secured Notes | Debt instrument, redemption, period two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, redemption price, percentage | 100.00% |  |  |
Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, redemption price, percentage | 101.00% |  |  |

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