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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2018
 
2017
 
2018
 
2017
PRSU expense (benefit)
$
0.7

 
$
1.2

 
$
1.5

 
$
(8.1
)
Option expense
1.9

 
1.8

 
3.8

 
3.8

RSU/DSU expense
4.2

 
3.0

 
7.8

 
6.9

Total stock-based compensation expense
$
6.8

 
$
6.0

 
$
13.1

 
$
2.6