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Share Repurchases and Dividends (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of share repurchase activity Share repurchase activity during the years ended December 31, 2018 and 2017 follows (in millions except per share amounts):
 
2018
 
2017
Number of shares repurchased
10.7

 
9.6

Amount paid
$
736.9

 
$
610.7

Weighted average cost per share
$
69.06

 
$
63.84