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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract] |
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 |

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