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Employee Benefits Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
The following table presents additional information about our significant foreign pension plan assets for which we utilize Level 3 inputs to determine fair value.
 
Years ended December 31,
Plan assets subject to fair value hierarchy, level 3
2017
 
2016
Balance at beginning of period
$
28.0

 
$
31.0

Actual return on plan assets
1.5

 
(3.0
)
Balance at end of period
$
29.5

 
$
28.0