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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, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 716.3 | $ 556.2 | $ 626.7 | $ 520.4
Included in Condensed Consolidated Statements of Operations | (0.4) | (2.4) | (0.2) | (3.9)
Included in Other Comprehensive Income | 19.1 | 1.1 | 36.9 | (5.3)
Purchases | 67.4 | 50.1 | 227.1 | 178.9
Settlements | (50.8) | (30.4) | (119.0) | (114.6)
Sales | (33.2) | (0.9) | (52.5) | (1.2)
Transfers into Level 3 | 0 | 3.0 | 0 | 8.2
Transfers out of Level 3 | 0 | 0 | (0.6) | (5.8)
Balance at End of Period | 718.4 | 576.7 | 718.4 | 576.7
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 | 384.8 | 351.5 | 364.1 | 361.0
Included in Condensed Consolidated Statements of Operations | (1.8) | (1.8) | (4.1) | (2.7)
Included in Other Comprehensive Income | (1.4) | 0.9 | 4.0 | (7.2)
Purchases | 31.7 | 17.3 | 117.6 | 92.9
Settlements | (41.6) | (21.0) | (92.4) | (94.1)
Sales | (30.7) | (0.5) | (47.6) | (0.5)
Transfers into Level 3 |  | 3.0 |  | 5.8
Transfers out of Level 3 |  |  | (0.6) | (5.8)
Balance at End of Period | 341.0 | 349.4 | 341.0 | 349.4
Redeemable Preferred Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 7.1 | 4.3 | 7.4 | 4.7
Included in Condensed Consolidated Statements of Operations | 0 | 0 | 0 | (0.4)
Included in Other Comprehensive Income | 0.5 | (0.1) | 0.4 | (0.1)
Purchases | 0 | 5.1 | 0 | 5.1
Settlements | (0.2) | (0.1) | (0.4) | (0.1)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 7.4 | 9.2 | 7.4 | 9.2
Collateralized Loan Obligations [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 49.5 | 29.8 | 44.7 | 0
Included in Condensed Consolidated Statements of Operations | 0 | 0 | 0.1 | 0.1
Included in Other Comprehensive Income | (0.3) | 0.4 | (0.4) | 0
Purchases | 13.3 | 11.1 | 18.1 | 41.2
Settlements | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 62.5 | 41.3 | 62.5 | 41.3
Mortgage and Asset-backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 3.9 | 6.7 | 4.5 | 0.1
Included in Condensed Consolidated Statements of Operations | 0 | 0 | 0.1 | 0
Included in Other Comprehensive Income | 0.1 | (0.1) | 0.2 | (0.3)
Purchases | 0 | 0.1 | 0 | 4.6
Settlements | 0 | 0 | (0.8) | (0.1)
Sales | 0 | 0 | 0 | 0
Transfers into Level 3 |  | 0 |  | 2.4
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 4.0 | 6.7 | 4.0 | 6.7
Preferred and Common Stocks [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 36.3 | 16.6 | 32.1 | 13.3
Included in Condensed Consolidated Statements of Operations | 0.8 | (0.9) | 3.1 | (1.0)
Included in Other Comprehensive Income | 1.0 | 0.8 | 3.0 | 3.9
Purchases | 0.1 | 0 | 2.8 | 0.6
Settlements | (0.8) | 0 | (3.6) | 0
Sales | (2.2) | (0.4) | (2.2) | (0.7)
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 35.2 | 16.1 | 35.2 | 16.1
Other Equity Interests [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 194.4 | 147.3 | 173.9 | 141.3
Included in Condensed Consolidated Statements of Operations | 0.3 | 0.3 | 0 | 0.1
Included in Other Comprehensive Income | 19.2 | (0.8) | 29.7 | (1.6)
Purchases | 12.3 | 16.5 | 38.6 | 34.5
Settlements | (8.2) | (9.3) | (21.8) | (20.3)
Sales | (0.3) | 0 | (2.7) | 0
Transfers into Level 3 |  | 0 |  | 0
Transfers out of Level 3 |  |  | 0 | 0
Balance at End of Period | 217.7 | 154.0 | 217.7 | 154.0
Fair Value Option Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at Beginning of Period | 40.3 |  | 0 |
Included in Condensed Consolidated Statements of Operations | 0.3 |  | 0.6 |
Included in Other Comprehensive Income | 0 |  | 0 |
Purchases | 10.0 |  | 50.0 |
Settlements | 0 |  | 0 |
Sales | 0 |  | 0 |
Transfers out of Level 3 |  |  | 0 |
Balance at End of Period | $ 50.6 |  | $ 50.6 |

X
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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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