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Debt (Tables)
6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Total amortized cost of Long-term Debt outstanding at June 30, 2020 and December 31, 2019 was:
(Dollars in Millions)
 
Jun 30,
2020
 
Dec 31,
2019
Term Loan due July 5, 2023
 
$
49.9

 
$
49.9

5.0% Senior Notes due September 19, 2022
 
279.1

 
279.9

4.35% Senior Notes due February 15, 2025
 
448.7

 
448.6

Total Long-term Debt Outstanding
 
$
777.7

 
$
778.4