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Debt (Tables)
3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of Long-term Debt outstanding at March 31, 2023 and December 31, 2022 was:
(Dollars in Millions)Mar 31,
2023
Dec 31,
2022
Senior Notes:
4.350% Senior Notes due February 15, 2025
$449.4 $449.3 
2.400% Senior Notes due September 30, 2030
396.7 396.6 
3.800% Senior Notes due February 23, 2032
395.6 395.5 
    5.875% Fixed-Rate Reset Junior Subordinated Debentures Due 2062
145.8 145.5 
Total Long-term Debt Outstanding$1,387.5 $1,386.9