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Debt and Credit Facility - Senior Secured Notes (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | May 31, 2018
Debt Instrument [Line Items] |  |  |
Debt issuance costs, net | $ 77,600,000 | $ 83,600,000 | $ 24,400,000
Debt instrument, unamortized discount | $ 1,238,900,000 | 1,268,700,000 | 10,500,000
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 | $ 7,800,000 | 8,800,000 |
Debt instrument, unamortized discount | $ 3,400,000 | 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 | $ 9,600,000 | 10,200,000 |
Debt instrument, unamortized discount | $ 4,200,000 | $ 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% |  |
Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, redemption price, percentage | 101.00% |  |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: 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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