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Pension and Postretirement Health and Life Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
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
September 30,
 
Nine Months Ended
September 30,
 
Successor
 
 
Predecessor
 
Successor
 
 
Predecessor
 
2015
 
 
2014
 
2015
 
 
2014
Service costs
$
1.1

 
 
$
0.6

 
$
3.1

 
 
$
1.8

Interest costs
9.2

 
 
10.6

 
27.8

 
 
31.7

Expected return on plan assets (gains)
(12.2
)
 
 
(12.9
)
 
(36.6
)
 
 
(38.5
)
Amortization of actuarial (gains) losses, net
—

 
 
0.4

 
—

 
 
1.0

Actuarial (gain) loss from remeasurements, net
24.8

 
 
—

 
20.9

 
 
—

Curtailment (gain)
—

 
 
(2.2
)
 
—

 
 
(2.2
)
Net periodic benefit cost (credit)
$
22.9

 
 
$
(3.5
)
 
$
15.2

 
 
$
(6.2
)


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,
 
Successor
 
 
Predecessor
 
Successor
 
 
Predecessor
 
2015
 
 
2014
 
2015
 
 
2014
Service costs
$
0.1

 
 
$
0.4

 
$
0.2

 
 
$
1.3

Interest costs
2.2

 
 
2.5

 
6.6

 
 
7.5

Expected return on plan assets (gains)
(0.2
)
 
 
(0.5
)
 
(0.7
)
 
 
(1.5
)
Amortization of prior service (credits), net
(0.1
)
 
 
(0.1
)
 
(0.2
)
 
 
(0.3
)
Net periodic benefit cost
$
2.0

 
 
$
2.3

 
$
5.9

 
 
$
7.0