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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 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 
 September 30,
 
Nine Months Ended 
 September 30,
(in millions)
2017
 
2016
 
2017
 
2016
PRSU expense (benefit)
$
1.0

 
$
1.8

 
$
(7.1
)
 
$
6.0

Option expense
1.8

 
1.2

 
5.6

 
4.0

RSU/DSU expense
3.1

 
1.7

 
10.0

 
5.3

Total stock-based compensation expense
$
5.9

 
$
4.7

 
$
8.5

 
$
15.3