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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended March 31,
(in millions)
 
2014
 
2013
Service cost - benefits earned during the period
 
$
1.9

 
$
3.5

Interest cost on projected benefit obligation
 
8.6

 
8.1

Expected return on plan assets
 
(12.0
)
 
(12.0
)
Settlement loss
 
0.4

 
—

Curtailment loss
 
0.9

 
—

Amortization:
 
 
 
 
Unrecognized transition obligation
 
0.1

 
0.1

Prior service cost
 
0.4

 
0.4

Actuarial net loss
 
2.8

 
6.6

Net periodic benefit cost
 
$
3.1

 
$
6.7