Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental disclosure of cash flow information

Supplemental disclosure of cash flow information (in millions):

	Year Ended December 31,
	2016		2015		2014
Cash payments:
Interest paid during the year	$	22.9	$	24.3	$	25.2
Income taxes paid during the year	164.5		217.4		205.4
Non cash investing and financing activities:
Changes in accrued capital expenditures	2.0		4.0		3.3
Gain on contract to repurchase common stock	—		—		18.1
Charitable contribution of marketable securities	2.0		—		0.5
Deposits with broker for securities sold short	8.4		10.8		—
Securities sold short	8.2		10.7		—