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Pension Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule Of Defined Benefit Plans Disclosures
For the three month periods ended March 31, 2015 and 2014, the components of pension expense and components of 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,
 
2015
 
2014
 
2015
 
2014
Service cost - benefits earned during the year
$
5.7

 
$
7.4

 
$
0.7

 
$
0.7

Interest cost on benefits earned in prior years
30.3

 
33.4

 
4.5

 
6.0

Expected return on plan assets
(42.1
)
 
(46.1
)
 
—

 
—

Amortization of prior service cost (credit)
0.3

 
0.6

 
1.2

 
(0.8
)
Amortization of net actuarial loss
15.1

 
18.5

 
3.6

 
3.5

Total retirement benefit expense
$
9.3

 
$
13.8

 
$
10.0

 
$
9.4