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Debt (Tables)
9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of Long-term Debt outstanding at September 30, 2022 and December 31, 2021 was:
(Dollars in Millions)Sep 30,
2022
Dec 31,
2021
    5.000% Senior Notes due September 19, 2022
$— $276.7 
    4.350% Senior Notes due February 15, 2025
449.3 449.0 
    2.400% Senior Notes due September 30, 2030
396.5 396.2 
    3.800% Senior Notes due February 23, 2032
395.3 — 
5.875% Fixed-Rate Reset Junior Subordinated Debentures Due 2062
145.3 — 
Total Long-term Debt Outstanding$1,386.4 $1,121.9