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Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 804.7 |
Other comprehensive income, net of tax |  |  | 4.0 |
Ending balance | $ 783.6 |  | 783.6 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (35.4) | $ (29.8) | (37.1) | $ (31.3)
Reclassification from AOCI, Current Period, Tax | (0.5) | (0.4) | (1.6) | (1.2)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 0.9 | 0.7 | 2.6 | 2.1
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | (0.1) | 0.0 | (0.1) | 0.1
Other comprehensive income, net of tax | 0.8 | 0.7 | 2.5 | 2.2
Ending balance | (34.6) | (29.1) | (34.6) | (29.1)
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 | 0.6 | 0.3
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 | 3.6 | 3.0
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 1.1 | 0.2 | 0.8 | (0.1)
OCI, before Reclassifications, before Tax, Attributable to Parent | 1.0 | 0.9 | 3.1 | 1.3
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.4) | (0.4) | (1.2) | (0.5)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.6 | 0.5 | 1.9 | 0.8
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (0.5) | (0.3) | (2.1) | (0.3)
Reclassification from AOCI, Current Period, Tax | 0.2 | 0.1 | 0.8 | 0.1
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.3) | (0.2) | (1.3) | (0.2)
Other comprehensive income, net of tax | 0.3 | 0.3 | 0.6 | 0.6
Ending balance | 1.4 | 0.5 | 1.4 | 0.5
Accumulated Other Comprehensive Loss (Other) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.0 | (0.3) | (0.4) | (0.3)
OCI, before Reclassifications, before Tax, Attributable to Parent | 1.1 | 0.1 | 1.4 | 0.2
Other Comprehensive Income (Loss) before Reclassifications, Tax | (0.4) | 0.0 | (0.5) | (0.1)
OCI, before Reclassifications, Net of Tax, Attributable to Parent | 0.7 | 0.1 | 0.9 | 0.1
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent | (0.3) | 0.0 | 0.0 | 0.0
Reclassification from AOCI, Current Period, Tax | 0.1 | 0.0 | 0.0 | 0.0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (0.2) | 0.0 | 0.0 | 0.0
Other comprehensive income, net of tax | 0.5 | 0.1 | 0.9 | 0.1
Ending balance | 0.5 | (0.2) | 0.5 | (0.2)
AOCI Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (36.7) |
Other comprehensive income, net of tax |  |  | 4.0 |
Ending balance | $ (32.7) | $ (28.8) | $ (32.7) | $ (28.8)

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