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Debt and Credit Facility - Components (Details) - USD ($) $ in Millions	Sep. 30, 2018	May 31, 2018	Mar. 31, 2018	Feb. 28, 2017	Feb. 28, 2015
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	$ (1,327.0)	$ (10.5)	$ (1,372.9)
Debt issuance costs	(101.2)	$ (24.4)	(40.1)	$ (33.7)
2023 Senior Secured Notes
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	(4.9)		0.0
Debt issuance costs	(11.4)		0.0
2021 Senior Secured Notes
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	(4.7)		0.0
Debt issuance costs	(10.8)		0.0
2017 Senior Convertible Debt
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	(589.4)		(616.3)
Debt issuance costs	(15.4)		(16.1)
2015 Senior Convertible Debt
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	(376.2)		(400.3)
Debt issuance costs	(13.8)		(14.8)
2017 Junior Convertible Debt
Debt Instrument [Line Items]
Amount of unamortized debt discount of debentures	(351.8)		(356.3)
Debt issuance costs	(3.3)		(3.3)		$ (30.3)
Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs	(16.5)		(5.9)
Term Loan Facility
Debt Instrument [Line Items]
Debt issuance costs	$ (30.0)		$ 0.0

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Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: 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

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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