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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures [Table Text Block]
For the three month periods ended September 30, 2017 and 2016, 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 September 30,
 
Three months ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost - benefits earned during the year
$
3.5

 
$
5.2

 
$
0.6

 
$
0.6

Interest cost on benefits earned in prior years
29.2

 
31.4

 
3.7

 
4.0

Expected return on plan assets
(36.7
)
 
(37.2
)
 
—

 
—

Amortization of prior service cost (credit)
0.3

 
0.3

 
(0.7
)
 
(0.7
)
Amortization of net actuarial loss
15.6

 
16.3

 
2.2

 
2.4

Total retirement benefit expense
$
11.9

 
$
16.0

 
$
5.8

 
$
6.3


For the nine month periods ended September 30, 2017 and 2016, 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
 
Nine months ended September 30,
 
Nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost - benefits earned during the year
$
10.5

 
$
15.5

 
$
1.8

 
$
1.9

Interest cost on benefits earned in prior years
87.6

 
94.1

 
11.0

 
12.0

Expected return on plan assets
(110.1
)
 
(111.5
)
 
—

 
—

Amortization of prior service cost (credit)
0.9

 
0.9

 
(2.1
)
 
(0.9
)
Amortization of net actuarial loss
46.9

 
49.0

 
6.7

 
7.2

Total retirement benefit expense
$
35.8

 
$
48.0

 
$
17.4

 
$
20.2