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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Based Compensation Activity The following table shows a summary of RSU activity during the three and nine months ended September 30, 2017 and 2016:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
RSU compensation expense
$
6.3

 
$
6.2

 
$
17.1

 
$
15.0

Income tax benefit
(2.2
)
 
(2.2
)
 
(6.0
)
 
(5.3
)
RSU compensation expense, net of tax
$
4.1

 
$
4.0

 
$
11.1

 
$
9.7

RSUs granted
31,720

 
41,756

 
236,919

 
351,850

Weighted average grant date fair value per unit
$
103.64

 
$
88.13

 
$
99.77

 
$
79.45

Total fair value of vested RSUs
$
2.4

 
$
3.7

 
$
26.2

 
$
25.0

The following table shows a summary of PSU activity during the three and nine months ended September 30, 2017 and 2016:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
PSU compensation expense
$
4.9

 
$
9.1

 
$
5.0

 
$
13.3

Income tax benefit
(1.7
)
 
(3.2
)
 
(1.7
)
 
(4.7
)
PSU compensation expense, net of tax
$
3.2

 
$
5.9

 
$
3.3

 
$
8.6

PSUs granted
336

 
12,700

 
237,959

 
271,346

Weighted average grant date fair value per unit
$
112.32

 
$
91.12

 
$
112.32

 
$
81.30

Total fair value of vested PSUs
$
0.3

 
$
2.0

 
$
29.7

 
$
31.3