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Supplementary Data Share Repurchase Program (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
Number of shares repurchased
13.3

 
13.6

 
14.9

Aggregate cost, including fees
$
303.3

 
$
285.2

 
$
275.1

Average price per share, including fees
$
22.76

 
$
20.97

 
$
18.41