Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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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 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-04.(a))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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Number of defendants named in a legal action.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Debt - Senior Notes and Contingent Convertible Senior Notes Purchased Narrative (Details) (USD $)	0 Months Ended
	Dec. 30, 2014 Shareholder	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		100.00%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 0
Minimum [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Long-term Debt, Gross		50,000,000
Maximum [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Long-term Debt, Gross		75,000,000
2.5% Contingent Convertible Senior Notes due 2037 [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Long-term Debt, Gross		1,168,000,000	1,168,000,000
Debt Instrument, Interest Rate, Effective Percentage		8.00%
Debt Instrument, Interest Rate, Stated Percentage		2.50%
2.75% Contingent Convertible Senior Notes Due 2035 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.75%
2.75% Contingent Convertible Senior Notes Due 2035 [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Long-term Debt, Gross		396,000,000	396,000,000
Debt Instrument, Interest Rate, Effective Percentage		6.86%
Debt Instrument, Interest Rate, Stated Percentage		2.75%
2.25% Contingent Convertible Senior Notes Due 2038 [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Long-term Debt, Gross		$ 347,000,000	$ 347,000,000
Debt Instrument, Interest Rate, Effective Percentage		8.00%
Debt Instrument, Interest Rate, Stated Percentage		2.25%
6.775% Senior Notes Due 2019 [Member] \| Senior Notes [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.775%
Redemption of 2019 Notes [Member]
Long-Term Debt Instrument [Line Items]
Loss Contingency, Number of Defendants	6