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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Retirement Benefit Expense (Benefit)
Components of retirement benefits expense (income) are: 
 
Pension Benefits
 
Postretirement Medical and Life
Insurance Benefits
 
Three months ended March 31,
 
2018
 
2017
 
2018
 
2017
 
(In millions)
Interest cost on benefit obligation
$
12.4

 
$
14.4

 
$
0.3

 
$
0.4

Assumed return on plan assets
(15.0
)
 
(12.4
)
 
—

 
—

Amortization of prior service credits
—

 
—

 
(0.1
)
 
(0.1
)
Recognized net actuarial losses (gains)
17.7

 
17.0

 
(0.9
)
 
(1.0
)
Retirement benefits expense (income)
$
15.1

 
$
19.0

 
$
(0.7
)
 
$
(0.7
)