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Short-Term and Long-Term Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Short-Term and Long-Term Debt [Table Text Block]
The following tables present the Company’s short-term and long-term debt as of June 30, 2018, and December 31, 2017:
June 30, 2018
Principal

 
Unamortized Debt Issuance Costs
 
Total

Millions
 
 
 
 
 
Short-Term Debt

$57.1

 
$(0.4)
 

$56.7

Long-Term Debt
1,471.7

 
(9.5)
 
1,462.2

Total Debt

$1,528.8

 
$(9.9)
 

$1,518.9


December 31, 2017
Principal

 
Unamortized Debt Issuance Costs
 
Total

Millions
 
 
 
 
 
Short-Term Debt

$64.6

 
$(0.5)
 

$64.1

Long-Term Debt
1,448.7

 
(9.5)
 
1,439.2

Total Debt

$1,513.3

 
$(10.0)
 

$1,503.3