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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The following table sets forth the Company’s net periodic benefit costs related to its Pension Plan, SERP and Medical Plan:
 
Three Months Ended
 
March 31,
 
2016
 
2015
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.2

 
$
0.6

Interest cost
1.2

 
1.3

Expected return on plan assets
(1.4
)
 
(1.4
)
Amortization of prior service costs (1)
0.1

 
0.8

Amortization of actuarial losses (1)
0.2

 
0.3

Periodic expense
$
0.3

 
$
1.6

 
 
 
 
Medical Plan benefits
 
 
 
Interest cost
$
0.1

 
$
0.1

Periodic expense
$
0.1

 
$
0.1