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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Property and Equipment at Cost and Depreciable Useful Lives Cost and estimated useful lives of property and equipment by function are as follows (in millions of dollars):
Category20232022Useful Life
Land$— $—   
Work in process6.7 3.0   
Buildings and improvements0.4 0.4 30years
Computer hardware and software123.1 126.8 3to12 years
Equipment, furniture and fixtures22.6 22.7  5years
Leasehold improvements13.1 13.9 HQ: 15 years
Branches: Lesser of the lease or 5 years
Total property and equipment$165.9 $166.8