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Supplementary Data Share Repurchase Program (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
Number of shares repurchased
5.1

 
13.7

 
13.3

Aggregate cost, including fees
$
117.1

 
$
300.1

 
$
303.3

Average price per share, including fees
$
23.03

 
$
21.97

 
$
22.76