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Other Comprehensive Income and Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment | $ 57.7 | $ 123.1 | $ 91.3 | $ 221.3
Reclassification Adjustment for Amounts Included in Net Income | (19.0) | 1.7 | (24.1) | 4.2
Unrealized Holding Gains | 38.7 | 124.8 | 67.2 | 225.5
Foreign Currency Translation Adjustments | 0.7 | (0.1) | 0.8 | 0.0
Net Unrecognized Postretirement Benefit Costs Arising During the Period | 0.0 | (18.7) | 0.0 | (19.5)
Curtailment Cost Recognized | 0.0 | 1.0 | 0.0 | 1.0
Amortization of Net Unrecognized Postretirement Benefit Costs | (0.2) | 1.7 | (0.3) | 4.3
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax | (0.2) | 2.7 | (0.3) | 5.3
Net Unrecognized Postretirement Benefit Costs | 0.2 | 16.0 | 0.3 | 14.2
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | (5.6) | 0.0 | (7.6) | 0.0
Reclassification Adjustment for Amounts Included in Net Income | (1.1) | 0.0 | (1.1) | 0.0
Loss on Cash Flow Hedges | (4.5) | 0.0 | (6.5) | 0.0
Other Comprehensive Income Before Income Taxes | 34.7 | 108.7 | 61.2 | 211.3
Other Comprehensive Income Tax Benefit (Expense): |  |  |  |
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment | (20.2) | (43.4) | (32.1) | (78.0)
Reclassification Adjustment for Amounts Included in Net Income | 6.6 | (0.6) | 8.4 | (1.5)
Unrealized Holding Gains | (13.6) | (44.0) | (23.7) | (79.5)
Foreign Currency Translation Adjustments | (0.3) | 0.0 | (0.3) | 0.0
Net Unrecognized Postretirement Benefit Costs Arising During the Period | 0.0 | (6.6) | 0.0 | 6.9
Curtailment Loss Recognized | 0.0 | (0.4) | 0.0 | (0.4)
Amortization of Net Unrecognized Postretirement Benefit Costs | 0.1 | (0.5) | 0.1 | (1.5)
Total Reclassification Adjustments for Amounts Included in Net Income | 0.1 | (0.9) | 0.1 | (1.9)
Net Unrecognized Postretirement Benefit Costs | 0.1 | 5.7 | 0.1 | 5.0
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment | 2.0 | 0.0 | 2.7 | 0.0
Reclassification Adjustment for Amounts Included in Net Income | (0.4) | 0.0 | (0.4) | 0.0
Loss on Cash Flow Hedges | 1.6 | 0.0 | 2.3 | 0.0
Other Comprehensive Income Tax Expense | $ 12.2 | $ 38.3 | $ 21.6 | $ 74.5

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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Definition Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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