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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
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 (benefit) is presented in the following table:
 
Three Months Ended 
 March 31,
(in millions)
2018
 
2017
PRSU expense (benefit)
$
0.8

 
$
(9.3
)
Option expense
1.9

 
2.0

RSU/DSU expense
3.6

 
3.9

Total stock-based compensation expense (benefit)
$
6.3

 
$
(3.4
)