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Income Taxes Summary of Valuation Allowance (Tables)
 12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Summary of Valuation Allowance [Table Text Block]
The change in the valuation allowance is listed below.
 
Years ended December 31,
 
2017
 
2016
 
2015
Balance at beginning of period
$
255.6

 
$
275.1

 
$
332.2

Reversed to costs and expenses
(4.6
)
 
(15.4
)
 
(20.8
)
(Reversed) charged to gross tax assets and other accounts 1
(27.0
)
 
9.5

 
(9.2
)
Foreign currency translation
19.3

 
(13.6
)
 
(27.1
)
Balance at end of period
$
243.3

 
$
255.6

 
$
275.1