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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
 
2013
 
2012
 
2013
 
2012
Service cost - benefits earned during the period
 
$
3.6

 
$
3.7

 
$
7.1

 
$
7.3

Interest cost on projected benefit obligation
 
8.1

 
8.5

 
16.2

 
17.0

Expected return on plan assets
 
(12.0
)
 
(10.9
)
 
(24.0
)
 
(21.8
)
Settlement loss
 
—

 
—

 
—

 
3.1

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
—

 
0.1

 
0.1

Prior service cost
 
0.2

 
0.4

 
0.6

 
0.8

Actuarial net loss
 
6.4

 
7.0

 
13.0

 
14.1

Net periodic benefit cost
 
$
6.3

 
$
8.7

 
$
13.0

 
$
20.6