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Debt (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of Long-term Debt outstanding at December 31, 2018 and 2017 was:
DOLLARS IN MILLIONS
 
2018
 
2017
Term Loan due June 29, 2020
 
$
34.9

 
$

5.00% Infinity Senior Notes due September 19, 2022
 
281.5

 

4.35% Senior Notes due February 15, 2025
 
448.4

 
448.1

7.375% Subordinated Debentures due February 27, 2054
 
144.2

 
144.2

Total Long-term Debt Outstanding
 
$
909.0

 
$
592.3