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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Taxes [Abstract]  
Benefit for Income Taxes and Effective Income Tax Rate
The following table summarizes the Company's provision (benefit) for income taxes and effective income tax provision rate for the three and nine month periods ended September 30, 2018 and 2017.


 
For the Three
Month Periods Ended
September 30,
  
For the Nine
Month Periods Ended
September 30,
 
  
2018
  
2017
  
2018
  
2017
 
Income (loss) before income taxes
 
$
94.8
  
$
32.4
  
$
238.1
  
$
(166.3
)
Provision (benefit) for income taxes
 
$
22.6
  
$
4.4
  
$
63.2
  
$
(41.2
)
Effective income tax rate
  
23.8
%
  
13.6
%
  
26.5
%
  
24.8
%