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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Tables)
 12 Months Ended
Dec. 31, 2016
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of the effective income tax rate as reflected in our Consolidated Statements of Operations to the U.S. federal statutory income tax rate is listed below.
 
Years ended December 31,
 
2016
 
2015
 
2014
U.S. federal statutory income tax rate
35.0
%
 
35.0
%
 
35.0
%
 
 
 
 
 
 
Income tax provision at U.S. federal statutory rate
$
290.6

 
$
266.8

 
$
252.3

State and local income taxes, net of U.S. federal income tax benefit
4.3

 
18.3

 
21.4

Impact of foreign operations, including withholding taxes
(23.9
)
 
14.7

 
0.9

Change in net valuation allowance 1
(13.4
)
 
(20.6
)
 
(66.0
)
Divestitures
9.7

 
11.9

 
0.0

U.S. federal tax credits
(44.6
)
 
0.0

 
0.0

Stock compensation
(9.0
)
 
0.0

 
0.0

Increase/(decrease) in unrecognized tax benefits
(22.2
)
 
(6.5
)
 
5.2

Statutory tax rate changes
11.4

 
1.4

 
0.8

Other
(4.9
)
 
(3.2
)
 
1.9

Provision for income taxes
$
198.0

 
$
282.8

 
$
216.5

 
 
 
 
 
 
Effective income tax rate on operations
23.8
%
 
37.1
%
 
30.0
%
 
1
Reflects changes in valuation allowance that impacted the effective income tax rate for each year presented.