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v3.19.1

Debt and Credit Facility - Senior Secured Notes (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs, net | $ 83,600,000 | $ 24,400,000 | $ 40,100,000 | $ 33,700,000
Debt instrument, unamortized discount | $ 1,268,700,000 | 10,500,000 | $ 1,372,900,000 |
Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 101.00% |  |  |
2021 Senior Secured 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 | $ 8,800,000 |  |  |
Debt instrument, unamortized discount | $ 3,800,000 |  |  |
Effective interest rate |  | 3.922% |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Senior Secured Notes, 2023 |  |  |  |
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 | $ 10,200,000 |  |  |
Debt instrument, unamortized discount | $ 4,400,000 |  |  |
Effective interest rate |  | 4.333% |  |
Senior Secured Notes, 2023 | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Senior Secured Notes, 2023 | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |

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