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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2017
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)
2017
 
2016
PRSU (benefit) expense
$
(9.3
)
 
$
2.5

Option expense
2.0

 
1.7

RSU/DSU expense
3.9

 
1.9

Total stock-based compensation expense
$
(3.4
)
 
$
6.1