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Debt (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
September 30, 2018 and December 31, 2017 was:
(Dollars in Millions)
 
Sep 30,
2018
 
Dec 31,
2017
4.35% Senior Notes due February 15, 2025
 
$
448.4

 
$
448.1

5.0% Senior Notes due September 19, 2022
 
281.7

 

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
 
$
1,123.7

 
$
592.3