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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Feb. 15, 2015
contingent interest payment		$ 6.5
Fair value assumptions expected volatility rate	29.00%
fair value assumptions credit spread	5.00%
Convertible Debt, Fair Value Disclosures	$ 3,200.0
Minimum [Member]
fair value hypothetical increase decrease in volatility rate	24.00%
fair value hypothetical increase decrease in credit spread	4.00%
Maximum [Member]
fair value hypothetical increase decrease in volatility rate	34.00%
fair value hypothetical increase decrease in credit spread	6.00%
Due 2023 [Member]
Convertible Debt, Fair Value Disclosures	$ 742.0
Due 2025 [Member]
Convertible Debt, Fair Value Disclosures	$ 503.8

X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

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X

- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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- Definition

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- Definition

fair value hypothetical increase or decrease in credit spread

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- Definition

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