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Pension and Postretirement Health and Life Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
Predecessor
 
Defined Benefit Pension Plans
 
Postretirement Health and Life Benefit Plans
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service costs
$
0.6

 
$
1.4

 
$
1.8

 
$
8.8

 
$
0.4

 
$
0.9

 
$
1.3

 
$
2.7

Interest costs
10.6

 
11.5

 
31.7

 
33.5

 
2.5

 
2.2

 
7.5

 
6.7

Expected returns on plan assets (gains)
(12.9
)
 
(12.8
)
 
(38.5
)
 
(38.3
)
 
(0.5
)
 
(0.5
)
 
(1.5
)
 
(1.7
)
Amortization of actuarial (gains) losses, net
0.4

 
2.0

 
1.0

 
14.2

 
—

 
0.6

 
—

 
2.0

Amortization of prior service costs (credits)
—

 
—

 
—

 
0.7

 
(0.1
)
 
—

 
(0.3
)
 
—

Curtailment (gains)
(2.2
)
 
—

 
(2.2
)
 
(0.7
)
 
—

 
—

 
—

 
—

Net benefit costs (credits)
$
(3.5
)
 
$
2.1

 
$
(6.2
)
 
$
18.2

 
$
2.3

 
$
3.2

 
$
7.0

 
$
9.7