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Commitments and Contingencies Investments Contractual Obligations (Tables)
12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Other Commitments
($ in millions)Amount of Obligation
Alternative investments$254.3 
Non-publicly traded CLOs in our fixed income securities portfolio
86.7 
Non-publicly traded common stock within our equity portfolio40.0 
CMLs0.8 
Privately-placed corporate securities32.0 
Total$413.8