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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2014
Defined Benefit Pension Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Period Benefit Costs
Components of defined benefit pension plan net periodic gains are as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions)
2014
 
2013
 
2014
 
2013
Service cost
$
0.5

 
$
0.4

 
$
1.4

 
$
1.2

Interest cost
6.3

 
5.9

 
18.8

 
17.7

Expected return on plan assets
(8.1
)
 
(9.3
)
 
(24.2
)
 
(27.9
)
Net periodic benefit gains
$
(1.3
)
 
$
(3.0
)
 
$
(4.0
)
 
$
(9.0
)
Postretirement Health Care Plan Benefit [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Period Benefit Costs
Components of post-retirement health care plan benefit costs are as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions)
2014
 
2013
 
2014
 
2013
Interest cost
$
0.2

 
$
0.2

 
$
0.5

 
$
0.6

Net periodic benefit costs
$
0.2

 
$
0.2

 
$
0.5

 
$
0.6