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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 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 
 September 30,
 
Nine Months Ended 
 September 30,
(in millions)
2016
 
2015
 
2016
 
2015
PRSU expense
$
1.8

 
$
3.0

 
$
6.0

 
$
10.4

Option expense
1.2

 
1.4

 
4.0

 
4.8

RSU/DSU expense
1.7

 
0.5

 
5.3

 
1.2

Total stock-based compensation expense
$
4.7

 
$
4.9

 
$
15.3

 
$
16.4