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Debt (Tables)
12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of Long-term Debt outstanding at December 31, 2021 and 2020 was:
(Dollars in Millions)Dec 31,
2021
Dec 31,
2020
Term Loan due July 5, 2023$— $49.9 
5.000% Senior Notes due September 19, 2022
276.7 278.3 
4.350% Senior Notes due February 15, 2025
449.0 448.8 
2.400% Senior Notes due September 30, 2030
396.2 395.8 
Total Long-term Debt Outstanding$1,121.9 $1,172.8