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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2015
 
2014
 
2015
 
2014
Pension Plan and SERP benefits
(in millions)
Service cost
$
0.5

 
$
0.6

 
$
1.5

 
$
2.0

Interest cost
1.3

 
1.2

 
3.7

 
4.0

Expected return on plan assets
(1.5
)
 
(1.4
)
 
(4.3
)
 
(3.8
)
Amortization of prior service costs (1)
0.4

 
1.1

 
1.3

 
3.6

Amortization of actuarial losses (1)
0.1

 
0.2

 
0.4

 
0.6

Curtailment loss (2)
—

 
—

 
11.2

 
2.0

Special termination benefits (3)
—

 
—

 
—

 
0.3

Periodic expense
$
0.8

 
$
1.7

 
$
13.8

 
$
8.7

 
 
 
 
 
 
 
 
Medical Plan benefits
 
 
 
 
 
 
 
Interest cost
$
0.1

 
$
—

 
$
0.2

 
$
0.2

Amortization of prior service costs (1)
—

 
0.1

 
0.1

 
0.3

Curtailment loss (2)
—

 
—

 
—

 
0.4

Periodic expense
$
0.1

 
$
0.1

 
$
0.3

 
$
0.9