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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2019
 
2018
 
2017
U.S. federal statutory income tax rate
21.0
%
 
21.0
%
 
35.0
%
 
 
 
 
 
 
Income tax provision at U.S. federal statutory rate
$
184.5

 
$
176.0

 
$
294.3

State and local income taxes, net of U.S. federal income tax benefit
14.0

 
23.8

 
23.5

Impact of foreign operations, including withholding taxes
34.2

 
50.7

 
(6.7
)
U.S. tax incentives
(21.4
)
 
(17.5
)
 
(1.3
)
Change in net valuation allowance 1
(26.3
)
 
(16.9
)
 
1.4

Divestitures
9.6

 
11.7

 
1.1

U.S. federal tax credits 
0.4

 
(48.1
)
 
(0.4
)
Stock compensation
(3.3
)
 
(6.8
)
 
(15.3
)
Increase in unrecognized tax benefits
14.1

 
8.4

 
7.0

Net impact of the Tax Act
0.0

 
13.4

 
(36.0
)
Other
(1.0
)
 
4.5

 
3.7

Provision for income taxes
$
204.8

 
$
199.2

 
$
271.3

 
 
 
 
 
 
Effective income tax rate on operations
23.3
%
 
23.8
%
 
32.3
%
 
1
Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.