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Pension and Postretirement Health and Life Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
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 pension plans were as follows (in millions):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
1.0

 
$
1.1

 
$
2.9

 
$
3.1

Interest costs
8.9

 
9.2

 
26.6

 
27.8

Expected return on plan assets (gains)
(10.6
)
 
(12.2
)
 
(31.6
)
 
(36.6
)
Actuarial loss (gain) from remeasurement, net
—

 
24.8

 
0.8

 
20.9

Net periodic benefit cost (credit)
$
(0.7
)
 
$
22.9

 
$
(1.3
)
 
$
15.2
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 
 September 30,
 
Nine Months Ended 
 September 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
—

 
$
0.1

 
$
—

 
$
0.2

Interest costs
2.1

 
2.2

 
6.1

 
6.6

Expected return on plan assets (gains)
(0.1
)
 
(0.2
)
 
(0.2
)
 
(0.7
)
Amortization of prior service (credits), net
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.2
)
Net periodic benefit cost
$
1.9

 
$
2.0

 
$
5.7

 
$
5.9