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Income Taxes Schedule of Unrecognized Tax Benefits Activity (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
Balance at beginning of period
$
246.7

 
$
226.9

 
$
238.0

Increases as a result of tax positions taken during a prior year
6.3

 
65.0

 
5.2

Decreases as a result of tax positions taken during a prior year
(8.1
)
 
(47.5
)
 
(19.7
)
Settlements with taxing authorities
(0.8
)
 
(4.6
)
 
(4.1
)
Lapse of statutes of limitation
(3.3
)
 
(11.8
)
 
(3.8
)
Increases as a result of tax positions taken during the current year
31.1

 
18.7

 
11.3

Balance at end of period
$
271.9

 
$
246.7

 
$
226.9