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Debt (Narrative - 5.875% Senior Notes) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 27, 2016 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |
Principal amount of debt outstanding | $ 3,520 |  | $ 786
5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Coupon rate | 5.875% |  |
Principal amount issued |  | $ 520 |
Principal amount of debt outstanding | $ 520 |  | $ 0
Debt instrument redemption premium percentage, as a percentage of principal amount prepaid or redeemed | 1.00% |  |
Prior to November 1, 2019 | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 100.00% |  |
On or after November 1, 2019 | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 104.406% |  |
On or after November 1, 2020 | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 102.938% |  |
On or after November 1, 2021 | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 101.439% |  |
On or after November 1, 2022 | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 100.00% |  |
Change in Control | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 101.00% |  |
Certain Asset Disposition | 5.875% Senior Notes | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument redemption price percentage | 100.00% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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 Contractual interest rate for funds borrowed, under the debt agreement. + 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 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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