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Income Tax Matters, Reconciliation of Changes in the Gross Unrecognized Tax Benefits Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of changes in the gross unrecognized tax benefits: |  |  |
Gross unrecognized tax benefits at beginning of period | $ 2.2 | $ 3.8 | $ 15.7
Gross increases for tax positions of prior years | 0.1 | 0.0 | 0.0
Gross decreases for tax positions of prior years | 0.0 | 0.0 | (7.6)
Gross decrease for tax positions relating to lapse of a statute of limitation | (0.6) | (1.4) | (3.3)
Foreign currency translation | 0.0 | (0.2) | (1.0)
Gross unrecognized tax benefits at end of period | $ 1.7 | $ 2.2 | $ 3.8

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + 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) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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