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Income Taxes - Income Tax Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Taxes |  |  |
Increase (decrease) in additional liabilities related to unrecognized tax liabilities | $ 22.4 | $ 2.1 |
Increase (decrease) in assets related to unrecognized tax assets | (0.4) | 4.5 |
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense | (0.7) | 0.5 |
Unrecognized Tax Liabilities | 56.1 | 33.0 |
Unrecognized Tax Assets | 1.9 | 2.3 |
Reconciliation of total amounts of unrecognized income tax benefits |  |  |
Unrecognized Tax Liabilities - opening balance | 24.3 | 26.5 | $ 22.3
Gross increases - tax positions in prior period | 9.2 |  | 2.6
Gross decreases - tax positions in prior period | (4.8) | (2.8) |
Gross increases - tax positions in current period | 20.9 | 6.6 | 5.0
Settlements |  | (3.6) |
Lapse of statute of limitations | (2.9) | (2.4) | (3.4)
Unrecognized Tax Liabilities - ending balance | 46.7 | 24.3 | 26.5
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor | $ 45.3 |  |
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) | 20.70% |  |
Interest and penalties expense |  |  |
Interest related to unrecognized tax benefits, recorded as (income) expense | $ 0.9 | (0.6) | (0.6)
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense | (0.3) | (0.3) | $ (0.3)
Accrued interest and penalties |  |  |
Accrued interest related to unrecognized tax benefits | 5.2 | 4.2 |
Accrued penalties related to unrecognized tax benefits | $ 4.2 | $ 4.5 |

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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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