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Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Total amortized cost of Long-term Debt outstanding at September 30, 2020 and December 31, 2019 was:
(Dollars in Millions)Sep 30,
2020
Dec 31,
2019
Term Loan due July 5, 2023$49.9 $49.9 
5.000% Senior Notes due September 19, 2022278.7 279.9 
4.350% Senior Notes due February 15, 2025448.8 448.6 
2.400% Senior Notes due September 30, 2030395.6 — 
Total Long-term Debt Outstanding$1,173.0 $778.4