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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate reconciliation
The following table provides details of income taxes (in millions, except percentages):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Income before income taxes
$
152.0

 
$
225.8

 
$
344.3

 
$
611.6

Income tax (benefit) provision
$
(71.8
)
 
$
60.1

 
$
(30.4
)
 
$
157.3

Effective tax (benefit) rate
(47.2
)%
 
26.6
%
 
(8.8
)%
 
25.7
%