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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2014
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)
 
2014
 
2013
 
2014
 
2013
Service cost - benefits earned during the period
 
$
2.0

 
$
3.6

 
$
3.9

 
$
7.1

Interest cost on projected benefit obligation
 
8.4

 
8.1

 
17.0

 
16.2

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

 
—

 
0.4

 
—

Curtailment loss
 
—

 
—

 
0.9

 
—

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
—

 
0.1

 
0.1

Prior service cost
 
0.3

 
0.2

 
0.7

 
0.6

Actuarial net loss
 
3.0

 
6.4

 
5.8

 
13.0

Net periodic benefit cost
 
$
1.7

 
$
6.3

 
$
4.8

 
$
13.0