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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2012
Defined Benefit Pension Plan [Member]
  
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Period Benefit Costs
Components of defined benefit pension plan costs are as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(In millions)
2012
 
2011
 
2012
 
2011
Service cost
$
0.3

 
$
0.5

 
$
1.1

 
$
1.3

Interest cost
6.7

 
7.1

 
20.1

 
21.3

Expected return on plan assets
(6.9
)
 
(7.3
)
 
(20.7
)
 
(22.0
)
Amortization of transition obligation and prior service costs
—

 
—

 
—

 
0.1

Net periodic benefit costs
$
0.1

 
$
0.3

 
$
0.5

 
$
0.7
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)
2012
 
2011
 
2012
 
2011
Interest cost
$
0.2

 
$
0.3

 
$
0.7

 
$
0.9

Amortization of prior service costs
(4.4
)
 
(4.4
)
 
(13.1
)
 
(13.2
)
Net periodic benefit gains
$
(4.2
)
 
$
(4.1
)
 
$
(12.4
)
 
$
(12.3
)