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Investments - Summarized Financial Information, Alight (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Schedule of Equity Method Investments [Line Items]    
Depreciation and amortization $ 2.6 $ 3.1
Interest expense 2.3 3.8
Net loss from continuing operations (35.8) (38.7)
Net loss from discontinued operations 0.0 (76.3)
Net loss attributable to Alight (32.1) (113.0)
Alight    
Schedule of Equity Method Investments [Line Items]    
Total revenues 534.0 548.0
Depreciation and amortization 104.0 101.0
Interest expense 24.0 22.0
Gross profit 156.0 171.0
Net loss from continuing operations (19.0) (17.0)
Net loss from discontinued operations 0.0 (8.0)
Net loss attributable to Alight $ (19.0) $ (25.0)