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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2013
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)
 
2013
 
2012
 
2013
 
2012
Service cost - benefits earned during the period
 
$
3.5

 
$
3.7

 
$
10.6

 
$
11.0

Interest cost on projected benefit obligation
 
8.1

 
8.4

 
24.3

 
25.4

Expected return on plan assets
 
(12.0
)
 
(10.9
)
 
(36.0
)
 
(32.7
)
Settlement loss
 
—

 
—

 
—

 
3.1

Curtailment loss
 
0.4

 
—

 
0.4

 
—

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
0.1

 
0.1

 
0.2

 
0.2

Prior service cost
 
0.2

 
0.3

 
0.8

 
1.1

Actuarial net loss
 
6.5

 
7.1

 
19.5

 
21.2

Net periodic benefit cost
 
$
6.8

 
$
8.7

 
$
19.8

 
$
29.3