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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Pension Plan, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs

The components of net periodic benefit cost (credit) for the defined benefit pension plans were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Service costs
$
1.0

 
$
0.9

 
$
1.9

 
$
1.9

Interest costs
8.0

 
8.9

 
16.1

 
17.7

Expected gains on plan assets
(10.2
)
 
(10.5
)
 
(20.4
)
 
(21.0
)
Actuarial loss from remeasurement
—

 
0.8

 
—

 
0.8

Net periodic benefit cost (credit)
$
(1.2
)
 
$
0.1

 
$
(2.4
)
 
$
(0.6
)
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 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
Interest costs
$
1.8

 
$
1.9

 
$
3.6

 
$
4.0

Expected gains on plan assets
—

 
—

 
—

 
(0.1
)
Amortization of prior service credits, net
—

 
—

 
(0.1
)
 
(0.1
)
Net periodic benefit cost
$
1.8

 
$
1.9

 
$
3.5

 
$
3.8