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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Feb. 15, 2017
contingent interest payment |  | $ 7.7
Fair value assumptions expected volatility rate | 26.00% |
fair value assumptions credit spread | 4.00% |
Convertible Debt, Fair Value Disclosures | $ 2,800.0 |
Minimum [Member] |  |
fair value hypothetical increase decrease in volatility rate | 21.00% |
fair value hypothetical increase decrease in credit spread | 3.00% |
Maximum [Member] |  |
fair value hypothetical increase decrease in volatility rate | 31.00% |
fair value hypothetical increase decrease in credit spread | 5.00% |
Due 2025 [Member] |  |
Convertible Debt, Fair Value Disclosures | $ 514.1 |
Due 2023 [Member] |  |
Convertible Debt, Fair Value Disclosures | $ 764.1 |

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- 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 (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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