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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%

X

- 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
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-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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))
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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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=75038535&loc=d3e64711-112823

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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