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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Estimated net mark-to-market loss before tax within next twelve months | $ (7.4) |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 740.4 | $ 746.3
Other comprehensive income (loss), net of tax | 9.7 | (8.3)
Ending balance | 747.9 | 753.6
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (35.6) | (38.5)
Less: income tax benefit | (0.4) | (0.3)
Net loss (gain) reclassified from AOCI to Net income | 1.1 | 1.2
Other comprehensive income (loss), net of tax | 1.1 | 1.2
Ending balance | (34.5) | (37.3)
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 | 0.1 | 0.2
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 | 1.3
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.3 | 0.9
Unrealized gain on available for sale securities | 1.0 | 1.0
Less: income tax expense | (0.3) | (0.2)
Net unrealized gain on available for sale securities | 0.7 | 0.8
Reclassification of unrealized gain upon sale of available for sale securities | (1.2) | (1.5)
Less: income tax benefit | 0.3 | 0.5
Net loss (gain) reclassified from AOCI to Net income | (0.9) | (1.0)
Other comprehensive income (loss), net of tax | (0.2) | (0.2)
Ending balance | 0.1 | 0.7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (13.4) | 0.5
Unrealized gain on available for sale securities | 7.4 | (12.2)
Less: income tax expense | (1.8) | 3.0
Net unrealized gain on available for sale securities | 5.6 | (9.2)
Reclassification of unrealized gain upon sale of available for sale securities | 4.2 | (0.1)
Less: income tax benefit | (1.0) | 0.0
Net loss (gain) reclassified from AOCI to Net income | 3.2 | (0.1)
Other comprehensive income (loss), net of tax | 8.8 | (9.3)
Ending balance | (4.6) | (8.8)
Accumulated Other Comprehensive Loss (Other) [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (0.1) | 0.0
Other comprehensive income (loss), net of tax | 0.0 | 0.0
Ending balance | (0.1) | 0.0
AOCI Attributable to Parent [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (48.8) | (36.7)
Other comprehensive income (loss), net of tax | 9.7 | (8.3)
Ending balance | $ (39.1) | $ (45.4)

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