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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic benefit (credits) for the defined benefit pension plans were as follows (in millions):
 
Three Months Ended June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Service costs
$
0.8

 
$
0.9

 
$
1.6

 
$
1.7

Interest costs
7.6

 
7.2

 
15.2

 
14.4

Expected return on plan assets (gains)
(9.1
)
 
(10.3
)
 
(18.2
)
 
(20.5
)
Net periodic benefit (credits)
$
(0.7
)
 
$
(2.2
)
 
$
(1.4
)
 
$
(4.4
)


The components of net periodic benefit costs for the postretirement health and life benefit plans were as follows (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Interest costs
$
1.5

 
$
1.5

 
$
3.0

 
$
2.9

Amortization of prior service costs (credits), net
—

 
(0.1
)
 
(0.1
)
 
(0.1
)
Net periodic benefit costs
$
1.5

 
$
1.4

 
$
2.9

 
$
2.8