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Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures [Table Text Block]
For the three month periods ended June 30, 2019 and 2018, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 
 
Pension Benefits
 
Other Postretirement Benefits
 
Three months ended June 30,
 
Three months ended June 30,
 
2019
 
2018
 
2019
 
2018
Service cost - benefits earned during the year
$
3.1

 
$
4.0

 
$
0.4

 
$
0.6

Interest cost on benefits earned in prior years
26.4

 
26.3

 
3.7

 
3.2

Expected return on plan assets
(32.9
)
 
(39.5
)
 
—

 
—

Amortization of prior service cost (credit)
0.1

 
0.1

 
(0.7
)
 
(0.7
)
Amortization of net actuarial loss
18.4

 
16.5

 
3.4

 
2.6

Curtailment loss
—

 
0.4

 
—

 
—

Total retirement benefit expense
$
15.1

 
$
7.8

 
$
6.8

 
$
5.7

For the six month periods ended June 30, 2019 and 2018, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 
 
Pension Benefits
 
Other Postretirement Benefits
 
Six months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Service cost - benefits earned during the year
$
6.3

 
$
8.2

 
$
0.9

 
$
1.2

Interest cost on benefits earned in prior years
52.7

 
52.4

 
7.4

 
6.3

Expected return on plan assets
(65.7
)
 
(79.0
)
 
—

 
—

Amortization of prior service cost (credit)
0.2

 
0.2

 
(1.4
)
 
(1.4
)
Amortization of net actuarial loss
36.8

 
33.0

 
6.7

 
5.3

Curtailment loss
—

 
0.4

 
—

 
—

Total retirement benefit expense
$
30.3

 
$
15.2

 
$
13.6

 
$
11.4