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Income Taxes Schedule of Unrecognized Tax Benefits Activity (Tables)
 12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Unrecognized Tax Benefits Activity [Table Text Block]
The table below summarizes the activity related to our unrecognized tax benefits.
 
Years ended December 31,
 
2019
 
2018
 
2017
Balance at beginning of period
$
335.4

 
$
271.9

 
$
246.7

Increases as a result of tax positions taken during a prior year
22.7

 
65.9

 
6.3

Decreases as a result of tax positions taken during a prior year
(25.8
)
 
(10.8
)
 
(8.1
)
Settlements with taxing authorities
(8.1
)
 
(6.5
)
 
(0.8
)
Lapse of statutes of limitation
(0.6
)
 
(1.7
)
 
(3.3
)
Increases as a result of tax positions taken during the current year
21.7

 
16.6

 
31.1

Balance at end of period
$
345.3

 
$
335.4

 
$
271.9