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Pension and Postretirement Health and Life Benefits (Tables)
 3 Months Ended
Mar. 31, 2017
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs

The components of net periodic benefit credit for the pension plans were as follows (in millions):
 
Three Months Ended 
 March 31,
 
2017
 
2016
Service costs
$
0.9

 
$
0.9

Interest costs
8.1

 
8.9

Expected gains on plan assets
(10.2
)
 
(10.5
)
Net periodic benefit credit
$
(1.2
)
 
$
(0.7
)
Other Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
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,
 
2017
 
2016
Interest costs
$
1.8

 
$
2.1

Expected gains on plan assets
—

 
(0.1
)
Amortization of prior service credits, net
(0.1
)
 
(0.1
)
Net periodic benefit cost
$
1.7

 
$
1.9