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Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2013
Notes to Financial Statements [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | At March 31, 2013 and December 31, 2012, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows.
| March 31, 2013
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
| (in millions of dollars)
United States Government and Government Agencies and Authorities | $ | 1,027.3 |  |  | $ | 309.2 |  |  | $ | 1.4 |  |  | $ | 1,335.1 |
States, Municipalities, and Political Subdivisions | 1,550.8 |  |  | 308.5 |  |  | 5.5 |  |  | 1,853.8 |
Foreign Governments | 1,197.3 |  |  | 260.5 |  |  | — |  |  | 1,457.8 |
Public Utilities | 9,316.7 |  |  | 1,782.4 |  |  | 9.9 |  |  | 11,089.2 |
Mortgage/Asset-Backed Securities | 1,767.1 |  |  | 275.6 |  |  | 0.5 |  |  | 2,042.2 |
All Other Corporate Bonds | 22,740.4 |  |  | 3,907.7 |  |  | 29.0 |  |  | 26,619.1 |
Redeemable Preferred Stocks | 33.0 |  |  | 6.3 |  |  | — |  |  | 39.3 |
Total Fixed Maturity Securities | $ | 37,632.6 |  |  | $ | 6,850.2 |  |  | $ | 46.3 |  |  | $ | 44,436.5 |
| December 31, 2012
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
| (in millions of dollars)
United States Government and Government Agencies and Authorities | $ | 1,020.9 |  |  | $ | 329.0 |  |  | $ | 1.1 |  |  | $ | 1,348.8 |
States, Municipalities, and Political Subdivisions | 1,498.4 |  |  | 316.2 |  |  | 7.8 |  |  | 1,806.8 |
Foreign Governments | 1,280.4 |  |  | 226.6 |  |  | — |  |  | 1,507.0 |
Public Utilities | 9,294.3 |  |  | 1,865.0 |  |  | 15.1 |  |  | 11,144.2 |
Mortgage/Asset-Backed Securities | 1,927.9 |  |  | 289.1 |  |  | 0.5 |  |  | 2,216.5 |
All Other Corporate Bonds | 22,696.6 |  |  | 4,245.3 |  |  | 31.5 |  |  | 26,910.4 |
Redeemable Preferred Stocks | 33.0 |  |  | 6.3 |  |  | — |  |  | 39.3 |
Total Fixed Maturity Securities | $ | 37,751.5 |  |  | $ | 7,277.5 |  |  | $ | 56.0 |  |  | $ | 44,973.0 |
As of March 31, 2013 and December 31, 2012, we held no fixed maturity securities for which a portion of an other-than-temporary impairment had previously been recognized in other comprehensive income.
Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position | The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.
| March 31, 2013
| Less Than 12 Months |  | 12 Months or Greater
| Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
| (in millions of dollars)
United States Government and Government Agencies and Authorities | $ | — |  |  | $ | — |  |  | $ | 6.2 |  |  | $ | 1.4 |
States, Municipalities, and Political Subdivisions | 91.0 |  |  | 1.8 |  |  | 45.3 |  |  | 3.7 |
Public Utilities | 224.4 |  |  | 4.1 |  |  | 57.4 |  |  | 5.8 |
Mortgage/Asset-Backed Securities | 2.5 |  |  | — |  |  | 3.8 |  |  | 0.5 |
All Other Corporate Bonds | 843.4 |  |  | 14.9 |  |  | 323.8 |  |  | 14.1 |
Total Fixed Maturity Securities | $ | 1,161.3 |  |  | $ | 20.8 |  |  | $ | 436.5 |  |  | $ | 25.5 |
| December 31, 2012
| Less Than 12 Months |  | 12 Months or Greater
| Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
| (in millions of dollars)
United States Government and Government Agencies and Authorities | $ | — |  |  | $ | — |  |  | $ | 6.5 |  |  | $ | 1.1 |
States, Municipalities, and Political Subdivisions | 30.8 |  |  | 0.9 |  |  | 42.1 |  |  | 6.9 |
Public Utilities | 110.3 |  |  | 3.9 |  |  | 147.6 |  |  | 11.2 |
Mortgage/Asset-Backed Securities | 4.4 |  |  | — |  |  | 3.8 |  |  | 0.5 |
All Other Corporate Bonds | 441.3 |  |  | 7.0 |  |  | 396.8 |  |  | 24.5 |
Total Fixed Maturity Securities | $ | 586.8 |  |  | $ | 11.8 |  |  | $ | 596.8 |  |  | $ | 44.2 |
Distribution of the Maturity Dates for Fixed Maturity Securities | The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.
| March 31, 2013
| Total Amortized Cost |  | Unrealized Gain Position |  | Unrealized Loss Position
|  | Gross Gain |  | Fair Value |  | Gross Loss |  | Fair Value
| (in millions of dollars)
1 year or less | $ | 1,059.7 |  |  | $ | 23.6 |  |  | $ | 1,040.1 |  |  | $ | 0.2 |  |  | $ | 43.0 |
Over 1 year through 5 years | 5,927.8 |  |  | 654.8 |  |  | 6,501.5 |  |  | 1.7 |  |  | 79.4 |
Over 5 years through 10 years | 9,756.5 |  |  | 1,548.7 |  |  | 10,799.5 |  |  | 8.0 |  |  | 497.7 |
Over 10 years | 19,121.5 |  |  | 4,347.5 |  |  | 22,461.7 |  |  | 35.9 |  |  | 971.4 |
| 35,865.5 |  |  | 6,574.6 |  |  | 40,802.8 |  |  | 45.8 |  |  | 1,591.5 |
Mortgage/Asset-Backed Securities | 1,767.1 |  |  | 275.6 |  |  | 2,035.9 |  |  | 0.5 |  |  | 6.3 |
Total Fixed Maturity Securities | $ | 37,632.6 |  |  | $ | 6,850.2 |  |  | $ | 42,838.7 |  |  | $ | 46.3 |  |  | $ | 1,597.8 |
| December 31, 2012
| Total Amortized Cost |  | Unrealized Gain Position |  | Unrealized Loss Position
|  | Gross Gain |  | Fair Value |  | Gross Loss |  | Fair Value
| (in millions of dollars)
1 year or less | $ | 956.4 |  |  | $ | 21.2 |  |  | $ | 934.1 |  |  | $ | 0.5 |  |  | $ | 43.0 |
Over 1 year through 5 years | 5,922.8 |  |  | 628.1 |  |  | 6,449.8 |  |  | 5.0 |  |  | 96.1 |
Over 5 years through 10 years | 9,752.3 |  |  | 1,606.4 |  |  | 10,997.0 |  |  | 7.6 |  |  | 354.1 |
Over 10 years | 19,192.1 |  |  | 4,732.7 |  |  | 23,200.2 |  |  | 42.4 |  |  | 682.2 |
| 35,823.6 |  |  | 6,988.4 |  |  | 41,581.1 |  |  | 55.5 |  |  | 1,175.4 |
Mortgage/Asset-Backed Securities | 1,927.9 |  |  | 289.1 |  |  | 2,208.3 |  |  | 0.5 |  |  | 8.2 |
Total Fixed Maturity Securities | $ | 37,751.5 |  |  | $ | 7,277.5 |  |  | $ | 43,789.4 |  |  | $ | 56.0 |  |  | $ | 1,183.6 |
Mortgage Loans by Property Type | Mortgage loans by property type and geographic region are as follows:
| March 31, 2013 |  | December 31, 2012
| (in millions of dollars)
| Carrying |  | Percent of |  | Carrying |  | Percent of
| Amount |  | Total |  | Amount |  | Total
Property Type |  |  |  |  |  |  |
Apartment | $ | 33.8 |  |  | 2.0 | % |  | $ | 34.0 |  |  | 2.0 | %
Industrial | 518.0 |  |  | 29.9 |  |  | 513.4 |  |  | 30.0 |
Mixed | 77.8 |  |  | 4.5 |  |  | 78.4 |  |  | 4.6 |
Office | 730.6 |  |  | 42.2 |  |  | 713.4 |  |  | 41.6 |
Retail | 370.2 |  |  | 21.4 |  |  | 373.5 |  |  | 21.8 |
Total | $ | 1,730.4 |  |  | 100.0 | % |  | $ | 1,712.7 |  |  | 100.0 | %
Mortgage Loans by Geographic Region |
Region |  |  |  |  |  |  |
New England | $ | 113.2 |  |  | 6.5 | % |  | $ | 114.3 |  |  | 6.7 | %
Mid-Atlantic | 158.9 |  |  | 9.2 |  |  | 160.0 |  |  | 9.3 |
East North Central | 233.1 |  |  | 13.5 |  |  | 224.7 |  |  | 13.1 |
West North Central | 158.0 |  |  | 9.1 |  |  | 160.8 |  |  | 9.4 |
South Atlantic | 437.8 |  |  | 25.3 |  |  | 440.9 |  |  | 25.7 |
East South Central | 79.1 |  |  | 4.6 |  |  | 79.6 |  |  | 4.7 |
West South Central | 157.8 |  |  | 9.1 |  |  | 159.5 |  |  | 9.3 |
Mountain | 89.6 |  |  | 5.2 |  |  | 90.5 |  |  | 5.3 |
Pacific | 302.9 |  |  | 17.5 |  |  | 282.4 |  |  | 16.5 |
Total | $ | 1,730.4 |  |  | 100.0 | % |  | $ | 1,712.7 |  |  | 100.0 | %
Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Internal Rating | Mortgage loans, sorted by the applicable credit quality indicators, are as follows:
| March 31 2013 |  | December 31 2012
| (in millions of dollars)
Internal Rating |  |  |
Aa | $ | 11.3 |  |  | $ | 11.5 |
A | 660.8 |  |  | 659.4 |
Baa | 1,005.6 |  |  | 994.5 |
Ba | 39.6 |  |  | 34.2 |
B | 13.1 |  |  | 13.1 |
Total | $ | 1,730.4 |  |  | $ | 1,712.7 |
Mortgage Loans, Sorted by Applicable Credit Quality Indicators, Loan to Value Ratio |
Loan-to-Value Ratio |  |  |
<= 65% | $ | 657.8 |  |  | $ | 624.7 |
> 65% <= 75% | 847.3 |  |  | 858.8 |
> 75% <= 85% | 131.5 |  |  | 142.5 |
> 85% | 93.8 |  |  | 86.7 |
Total | $ | 1,730.4 |  |  | $ | 1,712.7 |
Activity in the Allowance for Credit Losses | The activity in the allowance for credit losses is as follows:
| Three Months Ended March 31
| 2013 |  | 2012
| (in millions of dollars)
Balance at Beginning of Year | $ | 1.5 |  |  | $ | 1.5 |
Provision | — |  |  | 0.5 |
Balance at End of Period | $ | 1.5 |  |  | $ | 2.0 |
Impaired Mortgage Loans | Impaired mortgage loans are as follows:
| March 31, 2013
| (in millions of dollars)
|  |  | Unpaid |  |
| Recorded |  | Principal |  | Related
| Investment |  | Balance |  | Allowance
With No Related Allowance Recorded | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | — |
With an Allowance Recorded | 13.1 |  |  | 14.6 |  |  | 1.5 |
Total | $ | 17.4 |  |  | $ | 18.9 |  |  | $ | 1.5 |
| December 31, 2012
| (in millions of dollars)
|  |  | Unpaid |  |
| Recorded |  | Principal |  | Related
| Investment |  | Balance |  | Allowance
With No Related Allowance Recorded | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | — |
With an Allowance Recorded | 13.1 |  |  | 14.6 |  |  | 1.5 |
Total | $ | 17.4 |  |  | $ | 18.9 |  |  | $ | 1.5 |
Schedule of Financial Instrument and Derivative Offsetting [Table Text Block] | Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.
|  | Offsetting of Financial Assets and Derivative Assets
|  | March 31, 2013
|  | Gross |  |  |  | Net Amount of |  | Gross Amount Not |  |
|  | Amount of |  | Gross Amount |  | Assets |  | Offset in Balance Sheet |  |
|  | Recognized |  | Offset in |  | Presented in |  | Financial |  | Cash Collateral |  |
|  | Assets |  | Balance Sheet |  | Balance Sheet |  | Instruments |  | Received |  | Net Amount
|  | (in millions of dollars)
Derivatives |  | $ | 62.1 |  |  | $ | — |  |  | $ | 62.1 |  |  | $ | (53.6 | ) |  | $ | — |  |  | $ | 8.5 |
Securities Lending |  | 234.0 |  |  | — |  |  | 234.0 |  |  | — |  |  | (234.0 | ) |  | — |
Total |  | $ | 296.1 |  |  | $ | — |  |  | $ | 296.1 |  |  | $ | (53.6 | ) |  | $ | (234.0 | ) |  | $ | 8.5 |
|  | Offsetting of Financial Liabilities and Derivative Liabilities
|  | March 31, 2013
|  | Gross |  |  |  | Net Amount of |  | Gross Amount Not |  |
|  | Amount of |  | Gross Amount |  | Liabilities |  | Offset in Balance Sheet |  |
|  | Recognized |  | Offset in |  | Presented in |  | Financial |  | Cash Collateral |  |
|  | Liabilities |  | Balance Sheet |  | Balance Sheet |  | Instruments |  | Pledged |  | Net Amount
|  | (in millions of dollars)
Derivatives |  | $ | 157.4 |  |  | $ | — |  |  | $ | 157.4 |  |  | $ | (117.7 | ) |  | $ | (1.8 | ) |  | $ | 37.9 |
Securities Lending |  | 236.3 |  |  | — |  |  | 236.3 |  |  | (234.0 | ) |  | — |  |  | 2.3 |
Total |  | $ | 393.7 |  |  | $ | — |  |  | $ | 393.7 |  |  | $ | (351.7 | ) |  | $ | (1.8 | ) |  | $ | 40.2 |
|  | Offsetting of Financial Assets and Derivative Assets
|  | December 31, 2012
|  | Gross |  |  |  | Net Amount of |  | Gross Amount Not |  |
|  | Amount of |  | Gross Amount |  | Assets |  | Offset in Balance Sheet |  |
|  | Recognized |  | Offset in |  | Presented in |  | Financial |  | Cash Collateral |  |
|  | Assets |  | Balance Sheet |  | Balance Sheet |  | Instruments |  | Received |  | Net Amount
|  | (in millions of dollars)
Derivatives |  | $ | 81.6 |  |  | $ | — |  |  | $ | 81.6 |  |  | $ | (72.9 | ) |  | $ | — |  |  | $ | 8.7 |
Securities Lending |  | 452.8 |  |  | — |  |  | 452.8 |  |  | — |  |  | (452.8 | ) |  | — |
Total |  | $ | 534.4 |  |  | $ | — |  |  | $ | 534.4 |  |  | $ | (72.9 | ) |  | $ | (452.8 | ) |  | $ | 8.7 |
|  | Offsetting of Financial Liabilities and Derivative Liabilities
|  | December 31, 2012
|  | Gross |  |  |  | Net Amount of |  | Gross Amount Not |  |
|  | Amount of |  | Gross Amount |  | Liabilities |  | Offset in Balance Sheet |  |
|  | Recognized |  | Offset in |  | Presented in |  | Financial |  | Cash Collateral |  |
|  | Liabilities |  | Balance Sheet |  | Balance Sheet |  | Instruments |  | Pledged |  | Net Amount
|  | (in millions of dollars)
Derivatives |  | $ | 170.5 |  |  | $ | — |  |  | $ | 170.5 |  |  | $ | (129.8 | ) |  | $ | (1.8 | ) |  | $ | 38.9 |
Securities Lending |  | 455.8 |  |  | — |  |  | 455.8 |  |  | (452.8 | ) |  | — |  |  | 3.0 |
Total |  | $ | 626.3 |  |  | $ | — |  |  | $ | 626.3 |  |  | $ | (582.6 | ) |  | $ | (1.8 | ) |  | $ | 41.9 |
Investment Income [Table Text Block] | Net Investment Income Net investment income reported in our consolidated statements of income is as follows:
| Three Months Ended March 31
| 2013 |  | 2012
| (in millions of dollars)
Fixed Maturity Securities | $ | 589.9 |  |  | $ | 595.5 |
Derivative Financial Instruments | 7.7 |  |  | 6.3 |
Mortgage Loans | 26.0 |  |  | 25.0 |
Policy Loans | 3.7 |  |  | 3.6 |
Other Long-term Investments | 7.7 |  |  | 3.2 |
Short-term Investments | 0.8 |  |  | 1.2 |
Gross Investment Income | 635.8 |  |  | 634.8 |
Less Investment Expenses | 7.1 |  |  | 7.2 |
Less Investment Income on PFA Assets | 4.0 |  |  | 4.1 |
Less Amortization of Tax Credit Partnerships | 3.6 |  |  | 4.0 |
Net Investment Income | $ | 621.1 |  |  | $ | 619.5 |
Realized Investment Gains and Losses Reported in Consolidated Statements of Income | Realized Investment Gain and Loss Realized investment gains and losses reported in our consolidated statements of income are as follows:
| Three Months Ended March 31
| 2013 |  | 2012
| (in millions of dollars)
Fixed Maturity Securities |  |  |
Gross Gains on Sales | $ | 6.6 |  |  | $ | 5.9 |
Gross Losses on Sales | (5.5 | ) |  | (5.0 | )
Other-Than-Temporary Impairment Loss | (0.8 | ) |  | — |
Mortgage Loans and Other Invested Assets |  |  |
Gross Gains on Sales | 7.6 |  |  | — |
Impairment Loss | (1.0 | ) |  | (0.5 | )
Embedded Derivative in Modified Coinsurance Arrangement | 6.4 |  |  | 12.3 |
Other Derivatives | (0.3 | ) |  | — |
Foreign Currency Transactions | (2.7 | ) |  | (0.3 | )
Net Realized Investment Gain | $ | 10.3 |  |  | $ | 12.4 |

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- Definition Tabular disclosure of investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 13, 14, 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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