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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 556.2 | $ 404.4 | $ 520.4 | $ 348.1
Included in Condensed Consolidated Statements of Operations | (2.4) | 1.4 | (3.9) | 7.0
Included in Other Comprehensive Income | 1.1 | 8.3 | (5.3) | 5.3
Purchases | 50.1 | 44.2 | 178.9 | 157.9
Settlements | (30.4) | (13.6) | (114.6) | (64.2)
Sales | (0.9) |  | (1.2) | (4.2)
Transfers into Level 3 | 3.0 | 5.1 | 8.2 | 6.0
Transfers out of Level 3 | 0 | 0 | (5.8) | (6.1)
Balance at End of Period | 576.7 | 449.8 | 576.7 | 449.8
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 0 | 0 | 0
Fair Value, Level 2 to Level 1 Transfers, Amount | 0 | 0 | 0 | 0
Fair Value, Level 1 to level 3 Transfers, Amount | 0 | 0 | 0 | 0
Fair Value, Level 3 to level 1 Transfers, Amount | 0 | 0 | 0 | 0
Corporate Bonds and Notes [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 351.5 | 276.3 | 361.0 | 235.1
Included in Condensed Consolidated Statements of Operations | (1.8) | 1.4 | (2.7) | 3.5
Included in Other Comprehensive Income | 0.9 | 1.5 | (7.2) | 2.2
Purchases | 17.3 | 37.6 | 92.9 | 123.1
Settlements | (21.0) | (10.8) | (94.1) | (52.2)
Sales | (0.5) |  | (0.5) | (0.5)
Transfers into Level 3 | 3.0 | 5.1 | 5.8 | 6.0
Transfers out of Level 3 |  |  | (5.8) | (6.1)
Balance at End of Period | 349.4 | 311.1 | 349.4 | 311.1
Redeemable Preferred Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 4.3 | 4.6 | 4.7 | 6.1
Included in Condensed Consolidated Statements of Operations | 0 | 0 | (0.4) | 0
Included in Other Comprehensive Income | (0.1) | 0.2 | (0.1) | 0.3
Purchases | 5.1 | 0 | 5.1 | 0
Settlements | (0.1) | 0 | (0.1) | (1.6)
Sales | 0 |  | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 9.2 | 4.8 | 9.2 | 4.8
Mortgage and Asset-backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 36.5 | 0.2 | 0.1 | 0.3
Included in Condensed Consolidated Statements of Operations | 0 | 0 | 0.1 | 0
Included in Other Comprehensive Income | 0.3 | 0 | (0.3) | 0
Purchases | 11.2 | 0 | 45.8 | 0
Settlements | 0 | 0 | (0.1) | (0.1)
Sales | 0 |  | 0 | 0
Transfers into Level 3 | 0 | 0 | 2.4 | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 48.0 | 0.2 | 48.0 | 0.2
Preferred and Common Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 16.6 | 13.4 | 13.3 | 13.5
Included in Condensed Consolidated Statements of Operations | (0.9) | 0 | (1.0) | 3.2
Included in Other Comprehensive Income | 0.8 | 0.5 | 3.9 | (0.3)
Purchases | 0 | 0.1 | 0.6 | 1.3
Settlements | 0 | 0 | 0 | 0
Sales | (0.4) |  | (0.7) | (3.7)
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 16.1 | 14.0 | 16.1 | 14.0
Other Equity Interests [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 147.3 | 109.9 | 141.3 | 93.1
Included in Condensed Consolidated Statements of Operations | 0.3 | 0 | 0.1 | 0.3
Included in Other Comprehensive Income | (0.8) | 6.1 | (1.6) | 3.1
Purchases | 16.5 | 6.5 | 34.5 | 33.5
Settlements | (9.3) | (2.8) | (20.3) | (10.3)
Sales | 0 |  | 0 | 0
Transfers into Level 3 | 0 | 0 | 0 | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | $ 154.0 | $ 119.7 | $ 154.0 | $ 119.7

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- Definition The amount of transfers of assets, liabilities, and financial instruments classified in shareholders' equity measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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