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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation expense
A summary of the Company’s stock-based compensation expense is presented in the following table.
 
Three Months Ended 
 March 31,
(in millions)
2016
 
2015
PRSU expense
$
2.5

 
$
2.0

Option expense
1.7

 
1.5

RSU/DSU expense
1.9

 
0.5

Total stock-based compensation expense
$
6.1

 
$
4.0