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Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Estimated net mark-to-market loss before tax within next twelve months | $ (2.5) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 746.3 |
Other comprehensive (loss) income, net of tax |  |  | (1.9) |
Ending balance | 761.0 |  | 761.0 |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (37.3) | $ (36.2) | (38.5) | $ (37.1)
Less: income tax benefit | (0.4) | (0.6) | (0.7) | (1.1)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 1.2 | 0.8 | 2.4 | 1.7
Other comprehensive (loss) income, net of tax | 1.2 | 0.8 | 2.4 | 1.7
Ending balance | (36.1) | (35.4) | (36.1) | (35.4)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Reclassification of unrealized gain upon sale of available for sale securities | 0.2 | 0.2 | 0.4 | 0.4
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Reclassification of unrealized gain upon sale of available for sale securities | 1.4 | 1.2 | 2.7 | 2.4
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.7 | 0.9 | 0.9 | 0.8
Unrealized gain on available for sale securities | 1.3 | 1.0 | 2.3 | 2.1
Less: income tax expense | (0.4) | (0.4) | (0.6) | (0.8)
Net unrealized gain on available for sale securities | 0.9 | 0.6 | 1.7 | 1.3
Reclassification of unrealized gain upon sale of available for sale securities | (1.2) | (0.7) | (2.7) | (1.6)
Less: income tax benefit | 0.2 | 0.3 | 0.7 | 0.6
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (1.0) | (0.4) | (2.0) | (1.0)
Other comprehensive (loss) income, net of tax | (0.1) | 0.2 | (0.3) | 0.3
Ending balance | 0.6 | 1.1 | 0.6 | 1.1
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (8.8) | 0.1 | 0.5 |
Unrealized gain on available for sale securities | 10.9 | (0.1) | (1.3) | 0.2
Less: income tax expense | (2.6) | 0.0 | 0.4 | (0.1)
Net unrealized gain on available for sale securities | 8.3 | (0.1) | (0.9) | 0.1
Reclassification of unrealized gain upon sale of available for sale securities | (3.9) | 0.1 | (4.0) | 0.3
Less: income tax benefit | 0.9 | 0.0 | 0.9 | (0.1)
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | (3.0) | 0.1 | (3.1) | 0.2
Other comprehensive (loss) income, net of tax | 5.3 | 0.0 | (4.0) | 0.3
Ending balance | (3.5) | 0.1 | (3.5) | 0.1
Accumulated Other Comprehensive Loss (Other) [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.0 | (0.2) | 0.0 | (0.2)
Other comprehensive (loss) income, net of tax | 0.0 | 0.1 | 0.0 | 0.1
Ending balance | 0.0 | (0.1) | 0.0 | (0.1)
AOCI Attributable to Parent [Member] |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | (36.7) |
Other comprehensive (loss) income, net of tax |  |  | (1.9) |
Ending balance | $ (39.0) | $ (34.3) | $ (39.0) | $ (34.3)

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