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Pension and Postretirement Health and Life Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Benefit Costs

The components of net periodic benefit cost (credit) for the pension plans were as follows (in millions):
 
Three Months Ended
March 31,
 
2016
 
2015
Service costs
$
0.9

 
$
1.0

Interest costs
8.9

 
9.3

Expected return on plan assets (gains)
(10.5
)
 
(12.2
)
Net periodic benefit (credit)
$
(0.7
)
 
$
(1.9
)


The components of net periodic benefit cost for the postretirement health and life benefit plans were as follows (in millions):
 
Three Months Ended
March 31,
 
2016
 
2015
Service costs
$
—

 
$
0.1

Interest costs
2.1

 
2.2

Expected return on plan assets (gains)
(0.1
)
 
(0.2
)
Amortization of prior service (credits), net
(0.1
)
 
(0.1
)
Net periodic benefit cost
$
1.9

 
$
2.0