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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Retirement Benefit Expense (Benefit)
The following table presents the components of retirement benefits expense (income): 
 
Pension Benefits
 
Postretirement Medical and Life
Insurance Benefits
 
Three months ended March 31,
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Interest cost on benefit obligation
$
10.6

 
$
13.2

 
$
0.2

 
$
0.3

Expected return on assets
(15.1
)
 
(16.2
)
 
—

 
—

Amortization of prior service costs (credits)
0.1

 
—

 
—

 
(0.1
)
Amortization of net losses (gains)
14.3

 
10.2

 
(0.9
)
 
(0.9
)
Retirement benefits expense (income)
$
9.9

 
$
7.2

 
$
(0.7
)
 
$
(0.7
)