Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental disclosure of 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