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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
U.S. federal statutory income tax rate
35.0
%
 
35.0
%
 
35.0
%
 
 
 
 
 
 
Income tax provision at U.S. federal statutory rate
$
306.6

 
$
290.6

 
$
266.8

State and local income taxes, net of U.S. federal income tax benefit
23.5

 
4.3

 
18.3

Impact of foreign operations, including withholding taxes
(6.7
)
 
(23.9
)
 
14.7

Change in net valuation allowance 1
1.4

 
(13.4
)
 
(20.6
)
Divestitures
1.1

 
9.7

 
11.9

U.S. federal tax credits
(1.7
)
 
(44.6
)
 
0.0

Stock compensation
(15.3
)
 
(9.0
)
 
0.0

Increase/(decrease) in unrecognized tax benefits
7.0

 
(22.2
)
 
(6.5
)
Net impact of the Tax Act
(36.0
)
 
0.0

 
0.0

Statutory tax rate changes
0.0

 
11.4

 
1.4

Other
2.0

 
(4.9
)
 
(3.2
)
Provision for income taxes
$
281.9

 
$
198.0

 
$
282.8

 
 
 
 
 
 
Effective income tax rate on operations
32.2
%
 
23.8
%
 
37.1
%
 
1
Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.