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Debt (Tables)
3 Months Ended
Mar. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Total amortized cost of Long-term Debt, Current and Non-Current, outstanding at March 31, 2025 and December 31, 2024 was:
(Dollars in Millions)Mar 31,
2025
Dec 31,
2024
Senior Notes:
Current:
    4.350% Senior Notes due February 15, 2025
$— $449.9 
Non-Current:
    2.400% Senior Notes due September 30, 2030
397.6 397.5 
    3.800% Senior Notes due February 23, 2032
396.6 396.5 
5.875% Fixed-Rate Reset Junior Subordinated Debentures due 2062
147.9 147.7 
Total Long-term Debt Outstanding$942.1 $1,391.6