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Retirement Benefits
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits
The following table presents the components of retirement benefits expense (income): 
 
Pension Benefits
 
Postretirement Medical and Life
Insurance Benefits
 
Three months ended June 30,
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Interest cost on benefit obligation
$
10.6

 
$
13.1

 
$
0.2

 
$
0.3

Expected return on assets
(15.1
)
 
(16.2
)
 
—

 
—

Amortization of prior service costs (credits)
—

 
0.1

 
—

 
—

Amortization of net losses (gains)
14.4

 
10.2

 
(1.0
)
 
(1.0
)
Retirement benefits expense (income)
$
9.9

 
$
7.2

 
$
(0.8
)
 
$
(0.7
)

 
Pension Benefits
 
Postretirement Medical and Life
Insurance Benefits
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Interest cost on benefit obligation
$
21.2

 
$
26.3

 
$
0.4

 
$
0.6

Expected return on assets
(30.2
)
 
(32.4
)
 
—

 
—

Amortization of prior service costs (credits)
0.1

 
0.1

 
—

 
(0.1
)
Amortization of net losses (gains)
28.7

 
20.4

 
(1.9
)
 
(1.9
)
Retirement benefits expense (income)
$
19.8

 
$
14.4

 
$
(1.5
)
 
$
(1.4
)