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Supplementary Data Share Repurchase Program (Tables)
 12 Months Ended
Dec. 31, 2017
Share Repurchase Program [Abstract]  
Share Repurchase Program [Table Text Block]
The following table presents our share repurchase activity under our share repurchase programs.
 
Years ended December 31,
 
2017
 
2016
 
2015
Number of shares repurchased
13.7

 
13.3

 
13.6

Aggregate cost, including fees
$
300.1

 
$
303.3

 
$
285.2

Average price per share, including fees
$
21.97

 
$
22.76

 
$
20.97