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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Retirement Benefit Expense (Income)
Components of retirement benefit expense (benefit) are: 
 
Pension Benefits
 
Postretirement Medical and Life
Insurance Benefits
 
Three months ended March 31,
 
Three months ended February 28,
 
One month ended December 31,
 
Three months ended March 31,
 
Three months ended February 28,
 
One month ended December 31,
 
2016
 
2015
 
2015
 
2016
 
2015
 
2015
 
 
 
As Restated
 
 
 
 
 
 
 
 
 
(In millions)
 
 
Service cost
$
3.5

 
$
2.7

 
$
1.1

 
$
—

 
$
—

 
$
—

Interest cost on benefit obligation
16.0

 
15.9

 
5.3

 
0.5

 
0.5

 
0.2

Assumed return on plan assets
(17.5
)
 
(22.0
)
 
(6.0
)
 
—

 
—

 
—

Amortization of prior service credits
—

 
—

 
—

 
(0.3
)
 
(0.3
)
 
(0.1
)
Recognized net actuarial losses (gains)
15.9

 
20.9

 
5.4

 
(0.9
)
 
(0.9
)
 
(0.3
)
Retirement benefit expense (benefit)
$
17.9

 
$
17.5

 
$
5.8

 
$
(0.7
)
 
$
(0.7
)
 
$
(0.2
)