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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended March 31,
(in millions)
 
2013
 
2012
Service cost - benefits earned during the period
 
$
3.5

 
$
3.6

Interest cost on projected benefit obligation
 
8.1

 
8.5

Expected return on plan assets
 
(12.0
)
 
(10.9
)
Settlement loss
 
—

 
3.1

Amortization of unrecognized transition obligation
 
0.1

 
0.1

Amortization of prior service cost
 
0.4

 
0.4

Recognized actuarial net loss
 
6.6

 
7.1

Net periodic benefit cost
 
$
6.7

 
$
11.9