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Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Total amortized cost of Long-term Debt outstanding at December 31, 2020 and 2019 was:
DOLLARS IN MILLIONS20202019
Term Loan due July 5, 2023$49.9 $49.9 
5.000% Senior Notes due September 19, 2022
278.3 279.9 
4.350% Senior Notes due February 15, 2025
448.8 448.6 
2.400% Senior Notes due September 30, 2030
395.8 — 
Total Long-term Debt Outstanding$1,172.8 $778.4