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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(in millions of dollars)
Interest paid
$
21.6

 
$
21.1

 
$
17.7

Non-cash investing and financing activities (included in Accounts payable):
 
 
 
 
 
Unpaid purchases of property and equipment
$
7.0

 
$
7.4

 
$
4.6

Stock repurchases not yet settled
$
1.3

 
$
0.1

 
$
1.8

Acquisition of property and equipment through capital leasing arrangements
$
6.5

 
$
1.2

 
$
0.2

 
 
 
 
 
 
 
December 31,
 
2018
 
2017
 
2016
Components of cash, cash equivalents and restricted cash:
 
 
 
 
 
Cash and cash equivalents
$
125.6

 
$
51.1

 
$
55.2

Restricted cash included in Prepaid expenses and other current assets
0.3

 
0.3

 
0.3

Restricted cash included in Other assets
13.7

 
12.9

 
12.2

Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows
$
139.6

 
$
64.3

 
$
67.7