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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 804.7 |
Other comprehensive income, net of tax |  |  | 2.4 |
Ending balance | $ 768.8 |  | 768.8 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (36.2) | $ (30.5) | (37.1) | $ (31.3)
Reclassification from AOCI, Current Period, Tax | (0.6) | (0.4) | (1.1) | (0.8)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.8 | 0.7 | 1.7 | 1.4
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) | 0.0 | 0.0 | 0.0 | 0.1
Other comprehensive income, net of tax | 0.8 | 0.7 | 1.7 | 1.5
Ending balance | (35.4) | (29.8) | (35.4) | (29.8)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0.2 | 0.1 | 0.4 | 0.2
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 1.2 | 1.0 | 2.4 | 2.0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.9 | (0.1) | 0.8 | (0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent | 1.0 | 0.4 | 2.1 | 0.4
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.4) | (0.1) | (0.8) | (0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.6 | 0.3 | 1.3 | 0.3
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (0.7) | 0.0 | (1.6) | 0.0
Reclassification from AOCI, Current Period, Tax | 0.3 | 0.0 | 0.6 | 0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.4) | 0.0 | (1.0) | 0.0
Other comprehensive income, net of tax | 0.2 | 0.3 | 0.3 | 0.3
Ending balance | 1.1 | 0.2 | 1.1 | 0.2
Accumulated Other Comprehensive Loss (Other) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (0.1) | (0.2) | (0.4) | (0.3)
OCI, before Reclassifications, before Tax, Attributable to Parent | 0.0 | (0.1) | 0.3 | 0.1
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0.0 | 0.0 | (0.1) | (0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.0 | (0.1) | 0.2 | 0.0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | 0.1 | 0.0 | 0.3 | 0.0
Reclassification from AOCI, Current Period, Tax | 0.0 | 0.0 | (0.1) | 0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.1 | 0.0 | 0.2 | 0.0
Other comprehensive income, net of tax | 0.1 | (0.1) | 0.4 | 0.0
Ending balance | 0.0 | (0.3) | 0.0 | (0.3)
AOCI Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (36.7) |
Other comprehensive income, net of tax |  |  | 2.4 |
Ending balance | $ (34.3) | $ (29.9) | $ (34.3) | $ (29.9)

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- Definition Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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