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Income Taxes (Tables)
 6 Months Ended
Jun. 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 six month periods ended June 30, 2018 and 2017.

  
For the Three
Month Period Ended
June 30,
  
For the Six
Month Period Ended
June 30,
 
  
2018
  
2017
  
2018
  
2017
 
Income (loss) before income taxes
 
$
77.5
  
$
(190.2
)
 
$
143.4
  
$
(198.8
)
Provision (benefit) for income taxes
 
$
17.2
  
$
(43.9
)
 
$
40.7
  
$
(45.6
)
Effective income tax rate
  
22.2
%
  
23.1
%
  
28.4
%
  
22.9
%