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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
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)
2019
 
2018
PRSU expense
$
0.3

 
$
0.8

Option expense
1.2

 
1.9

RSU/DSU expense
5.1

 
3.6

Total stock-based compensation expense
$
6.6

 
$
6.3