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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions)
 
2012
 
2011
 
2012
 
2011
Service cost — benefits earned during the period
 
$
3.7

 
$
3.3

 
$
11.0

 
$
10.1

Interest cost on projected benefit obligation
 
8.4

 
8.8

 
25.4

 
26.5

Expected return on plan assets
 
(10.9
)
 
(10.1
)
 
(32.7
)
 
(30.3
)
Amortization of unrecognized transition obligation
 
0.1

 
0.1

 
0.2

 
0.2

Amortization of prior service cost
 
0.3

 
0.5

 
1.1

 
1.6

Recognized actuarial net loss
 
7.1

 
5.9

 
21.2

 
17.6

Settlement loss (gain)
 
—

 
—

 
3.1

 
(2.5
)
Net periodic benefit cost
 
$
8.7

 
$
8.5

 
$
29.3

 
$
23.2