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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
(in millions)
2017
 
2016
 
2017
 
2016
PRSU expense (benefit)
$
1.2

 
$
1.7

 
$
(8.1
)
 
$
4.2

Option expense
1.8

 
1.1

 
3.8

 
2.8

RSU/DSU expense
3.0

 
1.7

 
6.9

 
3.6

Total stock-based compensation expense
$
6.0

 
$
4.5

 
$
2.6

 
$
10.6