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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [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 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2019
 
2018
 
2019
 
2018
PRSU expense
$
0.4

 
$
0.7

 
$
0.7

 
$
1.5

Option expense
1.2

 
1.9

 
2.4

 
3.8

RSU/DSU expense
5.0

 
4.2

 
10.1

 
7.8

Total stock-based compensation expense
$
6.6

 
$
6.8

 
$
13.2

 
$
13.1