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Debt (Tables)
3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of Long-term Debt outstanding at March 31, 2022 and December 31, 2021 was:
(Dollars in Millions)Mar 31,
2022
Dec 31,
2021
Senior Notes:
5.000% Senior Notes due September 19, 2022
$— $276.7 
4.350% Senior Notes due February 15, 2025
449.1 449.0 
2.400% Senior Notes due September 30, 2030
396.3 396.2 
3.800% Senior Notes due February 23, 2032
395.1 — 
5.875% Fixed-Rate Reset Junior Subordinated Debentures Due 2062
144.7 — 
Total Long-term Debt Outstanding$1,385.2 $1,121.9