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Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | $ 449.2 | $ 1,044.2
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | (1.1) | (3.0)
Included in Other Comprehensive Income (Loss) | (5.0) | (34.8)
Purchases | 17.8 | 81.4
Settlements | 0.0 | 0.0
Sales | (31.1) | (44.8)
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | (0.6) | (557.7)
Balance at End of Period | 429.2 | 485.3
Bonds and Notes |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 433.0 | 409.1
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | (1.1) | (2.7)
Included in Other Comprehensive Income (Loss) | (3.7) | (24.8)
Purchases | 17.8 | 27.2
Settlements | 0.0 | 0.0
Sales | (30.9) | (18.2)
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | (0.6) | 0.0
Balance at End of Period | 414.5 | 390.6
States and Political Subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.0 | 0.0
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | 0.0 | 0.0
Included in Other Comprehensive Income (Loss) | 0.0 | 0.1
Purchases | 0.0 | 0.6
Settlements | 0.0 | 0.0
Sales | 0.0 | 0.0
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Balance at End of Period | 0.0 | 0.7
Redeemable Preferred Stocks |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 6.2 | 6.7
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | 0.0 |
Included in Other Comprehensive Income (Loss) | (0.5) |
Purchases | 0.0 |
Settlements | 0.0 |
Sales | 0.0 |
Transfers into Level 3 | 0.0 |
Transfers out of Level 3 | 0.0 |
Balance at End of Period | 5.7 | 6.7
Collateralized Loan Obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 0.0 | 618.2
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | 0.0 | (0.3)
Included in Other Comprehensive Income (Loss) | 0.0 | (9.5)
Purchases | 0.0 | 53.6
Settlements | 0.0 | 0.0
Sales | 0.0 | (26.4)
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | (557.7)
Balance at End of Period | 0.0 | 77.9
Other Mortgage- and Asset-backed |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at Beginning of Year | 10.0 | 10.2
Total Gains (Losses): |  |
Included in Condensed Consolidated Statement of Operations | 0.0 | 0.0
Included in Other Comprehensive Income (Loss) | (0.8) | (0.6)
Purchases | 0.0 | 0.0
Settlements | 0.0 | 0.0
Sales | (0.2) | (0.2)
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Balance at End of Period | $ 9.0 | $ 9.4

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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