Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

	Year Ended December 31,
	2017		2016		2015
	(in millions of dollars)
Interest paid	$	21.1	$	17.7	$	22.1
Non-cash investing and financing activities (included in Accounts payable):
Unpaid purchases of property and equipment	$	7.4	$	4.6	$	10.5
Stock repurchases not yet settled	$	0.1	$	1.8	$	0.2
Acquisition of property and equipment through capital leasing arrangements	$	1.2	$	0.2	$	—
	December 31,
	2017		2016		2015
Components of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	51.1	$	55.2	$	72.5
Restricted cash included in Prepaid expenses and other current assets	0.3		0.3		0.3
Restricted cash included in Other assets	12.9		12.2		10.9
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows	$	64.3	$	67.7	$	83.7