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Income Taxes Other Tax Disclosure (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | $ 0.0 | $ 10.5 | $ 6.1 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | 4.7 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | (3.5) | 8.1 | (6.1) |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 6.9 | 12.2 | $ 4.1 | $ 10.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 48.5 |  |  |
Lower range of expected tax payment for settlement of transfer pricing audits |  | 30.0 |  |  |
Upper range of expected payment for settlement of transfer pricing audits |  | 40.0 |  |  |
Settlement with Taxing Authority [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | $ 22.9 |  |  |  |
Tax positions relating to transfer pricing [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions |  | $ 11.5 | $ 23.1 |  |

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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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