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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule Of Defined Benefit Plans Disclosures [Table Text Block]
For the three month periods ended March 31, 2018 and 2017, 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 March 31,
 
Three months ended March 31,
 
2018
 
2017
 
2018
 
2017
Service cost - benefits earned during the year
$
4.2

 
$
3.5

 
$
0.6

 
$
0.6

Interest cost on benefits earned in prior years
26.1

 
29.2

 
3.1

 
3.7

Expected return on plan assets
(39.5
)
 
(36.7
)
 
—

 
—

Amortization of prior service cost (credit)
0.1

 
0.3

 
(0.7
)
 
(0.7
)
Amortization of net actuarial loss
16.5

 
15.6

 
2.7

 
2.2

Total retirement benefit expense
$
7.4

 
$
11.9

 
$
5.7

 
$
5.8