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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
June 30, 2018 and December 31, 2017 was:
(Dollars in Millions)
 
Jun 30,
2018
 
Dec 31,
2017
4.35% Senior Notes due February 15, 2025
 
$
448.2

 
$
448.1

7.375% Subordinated Debentures due February 27, 2054
 
144.2

 
144.2

Term Loan due June 29, 2020
 
249.4

 

Total Long-term Debt Outstanding
 
$
841.8

 
$
592.3