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Components of Net Periodic Benefit Cost (Tables)
 3 Months Ended
Mar. 31, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Components of net periodic benefit cost
 
 
Three Months Ended March 31,
(in millions)
 
2016
 
2015
Service cost - benefits earned during the period
 
$
1.9

 
$
2.0

Interest cost on projected benefit obligation
 
8.2

 
8.2

Expected return on plan assets
 
(12.9
)
 
(12.7
)
Settlement loss
 
0.1

 
—

Amortization:
 
 
 
 
Prior service cost
 
0.2

 
0.2

Actuarial net loss
 
3.6

 
5.0

Net periodic benefit cost
 
$
1.1

 
$
2.7