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Debt and Credit Facility - Senior Secured Notes (Details) - USD ($) | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | May 31, 2018 | Mar. 31, 2018 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs | $ 101,200,000 | $ 24,400,000 | $ 40,100,000 | $ 33,700,000
Debt instrument, unamortized discount | $ 1,327,000,000 | 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 | $ 10,800,000 |  | 0 |
Debt instrument, unamortized discount | $ 4,700,000 |  | 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 | $ 11,400,000 |  | 0 |
Debt instrument, unamortized discount | $ 4,900,000 |  | $ 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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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