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Stock-Based Compensation (Narrative) (Details) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 1.2 | 2.6 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares to be Repurchased Next Year | 0.5 |  |  |
Stock-based compensation expense | $ |  | $ 29.2 | $ 29.9 | $ 37.2
Stock Options [Member] |  |  |  |
Accelerated Vesting Conditions, Stock Options, Effective Period |  | 1 |  |
Accelerated Vesting Conditions, Stock Options, Employee Age |  | 65 |  |
2003 Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 0.9 |  |
Performance Based Restricted Stock Units [Member] |  |  |  |
Performance-based stock units awarded |  | 0.7 | 0.7 | 0.9
Shares entitled to recipients |  | 2.8 |  |
Percentage of units granted assumed |  | 100.00% |  |
Percentage of units that are earned, minimum |  | 0.00% |  |
Percentage of units that are earned, maximum |  | 200.00% |  |
Performance-based stock, outstanding |  | 1.7 |  |
Restricted Stock Units (RSU) [Member] |  |  |  |
Vesting period, years |  | 3 years |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ |  | $ 44.8 |  |
Share-based Compensation Not Yet Recognized, Weighted Average Period |  | 2 years |  |
2010 Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 0.3 |  |
Minimum [Member] | Stock Options [Member] |  |  |  |
Vesting period, years |  | 3 years |  |
Minimum [Member] | Stock Price Based RSU [Member] |  |  |  |
Vesting period, years |  | 1 year |  |
Minimum [Member] | Restricted Stock Units (RSU) [Member] |  |  |  |
Vesting period, years |  | 1 year |  |
Maximum [Member] | Stock Price Based RSU [Member] |  |  |  |
Vesting period, years |  | 7 years |  |
Maximum [Member] | Restricted Stock Units (RSU) [Member] |  |  |  |
Vesting period, years |  | 3 years |  |

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- Definition Maximum percentage applicable to performance based restricted stock units awarded based on the level of achievement of specified conditions at the vesting date. + References No definition available. + Details
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- Definition Minimum percentage applicable to performance based restricted stock units awarded based on the level of achievement of specified conditions at the vesting date. + References No definition available. + Details
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- Definition The number of outstanding performance share units that could be awarded based on performance as of the end of the reporting period. + References No definition available. + Details
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- Definition Percentage applicable to performance based restricted stock units awarded based on the threshold level of achievement of specified conditions at end of period. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An entity expecting to repurchase shares in the following period, generally discloses an estimate of the amount or range of shares to be repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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