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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2016
Pension Plan [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 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
0.9

 
$
1.0

 
$
1.9

 
$
2.0

Interest costs
8.9

 
9.3

 
17.7

 
18.6

Expected return on plan assets (gains)
(10.5
)
 
(12.2
)
 
(21.0
)
 
(24.4
)
Actuarial loss (gain) from remeasurement
0.8

 
(3.9
)
 
0.8

 
(3.9
)
Net periodic benefit cost (credit)
$
0.1

 
$
(5.8
)
 
$
(0.6
)
 
$
(7.7
)
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 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
—

 
$
—

 
$
—

 
$
0.1

Interest costs
1.9

 
2.2

 
4.0

 
4.4

Expected return on plan assets (gains)
—

 
(0.3
)
 
(0.1
)
 
(0.5
)
Amortization of prior service (credits), net
—

 
—

 
(0.1
)
 
(0.1
)
Net periodic benefit cost
$
1.9

 
$
1.9

 
$
3.8

 
$
3.9