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Components of Net Periodic Benefit Cost (Tables)
 6 Months Ended
Jun. 30, 2015
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)
 
2015
 
2014
 
2015
 
2014
Service cost - benefits earned during the period
 
$
1.9

 
$
2.0

 
$
3.9

 
$
3.9

Interest cost on projected benefit obligation
 
8.1

 
8.4

 
16.3

 
17.0

Expected return on plan assets
 
(12.7
)
 
(12.0
)
 
(25.4
)
 
(24.0
)
Settlement loss
 
—

 
—

 
—

 
0.4

Curtailment loss
 
—

 
—

 
—

 
0.9

Amortization:
 
 
 
 
 
 
 
 
Unrecognized transition obligation
 
—

 
—

 
—

 
0.1

Prior service cost
 
0.3

 
0.3

 
0.5

 
0.7

Actuarial net loss
 
5.1

 
3.0

 
10.1

 
5.8

Net periodic benefit cost
 
$
2.7

 
$
1.7

 
$
5.4

 
$
4.8