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Investments Investments - Distribution of Commercial Mortgage and Middle Market Loans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Commercial mortgage loans |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 211.5 | $ 163.6
Middle market loans |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 65.4 | $ 112.1
Investment, Net Carrying Value | Commercial mortgage loans | Product Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Investment, Net Carrying Value | Commercial mortgage loans | Product Concentration Risk | Apartment |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 101.6 | $ 80.7
Concentration risk percentage | 48.10% | 49.30%
Investment, Net Carrying Value | Commercial mortgage loans | Product Concentration Risk | Hotel |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 68.8 | $ 20.4
Concentration risk percentage | 32.50% | 12.50%
Investment, Net Carrying Value | Commercial mortgage loans | Product Concentration Risk | Office building |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 33.9 | $ 33.9
Concentration risk percentage | 16.00% | 20.70%
Investment, Net Carrying Value | Commercial mortgage loans | Product Concentration Risk | Other commercial |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 7.2 | $ 28.6
Concentration risk percentage | 3.40% | 17.50%
Investment, Net Carrying Value | Commercial mortgage loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Materials |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 20.9 | $ 28.0
Concentration risk percentage | 32.00% | 24.90%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Financials |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 6.1 | $ 27.1
Concentration risk percentage | 9.30% | 24.20%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Industrials |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 18.7 | $ 17.3
Concentration risk percentage | 28.50% | 15.50%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Consumer discretionary |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 4.3 | $ 13.7
Concentration risk percentage | 6.60% | 12.20%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Health care |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 0.0 | $ 7.5
Concentration risk percentage | 0.00% | 6.70%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Energy |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 5.6 | $ 7.3
Concentration risk percentage | 8.60% | 6.50%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Consumer staples |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 4.9 | $ 6.4
Concentration risk percentage | 7.50% | 5.70%
Investment, Net Carrying Value | Middle market loans | Product Concentration Risk | Information technology |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 4.9 | $ 4.8
Concentration risk percentage | 7.50% | 4.30%
Investment, Net Carrying Value | Middle market loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
U.S. | Investment, Net Carrying Value | Commercial mortgage loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 183.7 | $ 122.7
Concentration risk percentage | 86.90% | 75.00%
U.S. | Investment, Net Carrying Value | Middle market loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 56.2 | $ 91.8
Concentration risk percentage | 85.90% | 81.90%
International | Investment, Net Carrying Value | Commercial mortgage loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 27.8 | $ 40.9
Concentration risk percentage | 13.10% | 25.00%
International | Investment, Net Carrying Value | Middle market loans | Geographic Concentration Risk |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |
Fair market value, trading | $ 9.2 | $ 20.3
Concentration risk percentage | 14.10% | 18.10%

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