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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Net periodic pension and OPEB cost
 
Three Months Ended
 
September 30, 2018
 
September 30, 2017
 
Pension
 
OPEB
 
Consolidated
 
Pension
 
OPEB
 
Consolidated
 
(In millions)
Service cost:
 
 
 
 
 
 
 
 
 
 
Service cost
$
1.3

 
$
2.3

 
$
3.6

 
$
1.9

 
$
2.6

 
$
4.5

Other pension and postretirement costs (benefits), net:
 
 
 
 
 
 
 
 
 
 
Interest cost
$
40.2

 
$
6.5

 
$
46.7

 
$
51.8

 
$
7.7

 
$
59.5

Expected return on plan assets
(57.7
)
 
—

 
(57.7
)
 
(73.1
)
 
0.1

 
(73.0
)
Amortization of prior service cost (benefit)
0.1

 
(0.1
)
 
—

 
0.2

 
—

 
0.2

Amortization of net actuarial loss (gain)
1.8

 
(0.4
)
 
1.4

 
3.9

 
—

 
3.9

Curtailment, settlement or special termination benefit loss (gain)
0.9

 
1.1

 
2.0

 
—

 
—

 
—

Less: expected participant contributions
—

 
—

 
—

 
(0.2
)
 
—

 
(0.2
)
Total other pension and postretirement cost (benefits), net
$
(14.7
)
 
$
7.1

 
$
(7.6
)
 
$
(17.4
)
 
$
7.8

 
$
(9.6
)
 
 
 
 
 
 
 
 
 
 
 
 
Net periodic pension and OPEB cost (benefit)
$
(13.4
)
 
$
9.4

 
$
(4.0
)
 
$
(15.5
)
 
$
10.4

 
$
(5.1
)


 
Nine Months Ended
 
September 30, 2018
 
September 30, 2017
 
Pension
 
OPEB
 
Consolidated
 
Pension
 
OPEB
 
Consolidated
 
(In millions)
Service cost:
 

 
 

 
 
 
 
 
 
 
 
Service cost
$
4.1

 
$
6.9

 
$
11.0

 
$
5.6

 
$
8.0

 
$
13.6

Other pension and postretirement costs (benefits), net:
 
 
 
 
 
 
 
 
 
 
Interest cost
$
122.1

 
$
19.7

 
$
141.8

 
$
154.1

 
$
22.9

 
$
177.0

Expected return on plan assets
(176.3
)
 
—

 
(176.3
)
 
(215.2
)
 
0.2

 
(215.0
)
Amortization of prior service cost (benefit)
0.5

 
(0.2
)
 
0.3

 
0.5

 
—

 
0.5

Amortization of net actuarial loss (gain)
5.7

 
(1.1
)
 
4.6

 
8.6

 
—

 
8.6

Curtailment, settlement or special termination benefit loss (gain)
1.0

 
1.1

 
2.1

 
—

 
(2.9
)
 
(2.9
)
Less: expected participant contributions
—

 
—

 
—

 
(0.5
)
 
—

 
(0.5
)
Total other pension and postretirement cost (benefits), net
$
(47.0
)
 
$
19.5

 
$
(27.5
)
 
$
(52.5
)
 
$
20.2

 
$
(32.3
)
 
 
 
 
 
 
 
 
 
 
 
 
Net periodic pension and OPEB cost (benefit)
$
(42.9
)
 
$
26.4

 
$
(16.5
)
 
$
(46.9
)
 
$
28.2

 
$
(18.7
)