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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
Supplemental disclosure of cash flow information is shown in the following table (in millions):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Cash payments:
 
 
 
 
 
Interest paid during the year
$
26.3

 
$
22.9

 
$
24.3

Income taxes paid during the year
115.3

 
164.5

 
217.4

Non cash investing and financing activities:

 

 

Changes in accrued capital expenditures
1.6

 
2.0

 
4.0

Charitable contribution of marketable securities
13.6

 
2.0

 
—

Deposits with broker for securities sold short
6.9

 
8.4

 
10.8

Securities sold short
5.3

 
8.2

 
10.7