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Leases (Tables) | 12 Months Ended
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Dec. 31, 2019
Leases [Abstract] |
Components of Lease Cost | Operating lease cost was $16.6 million for the year ended December 31, 2019. The components of lease costs are as follows:
(millions of dollars) |  | Year Ended December 31, |
|  | 2019 |
Operating lease cost |  | $ | 15.5 |
Short-term lease cost |  |  | 1.1 |
Total |  | $ | 16.6 |
Supplemental Cash Flow Information and Non-cash Activity Related to Operating Leases | Supplemental cash flow information and non-cash activity related to our operating leases are as follows:
(millions of dollars) |  | December 31, 2019 |
Operating cash flows information: |  |  |
Cash paid for amounts included in the measurement of lease liabilities |  | $ | 16.2 |
Non-cash activity: |  |  |  |
Right-of-use assets obtained in the exchange for operating lease liabilities |  | $ | 7.3 |
Weighted Average Remaining Lease Term and Discount Rates | Weighted average remaining lease term, and weighted average discount rates related to the Company’s operating leases were as follows:
Weighted-average remaining operating lease term (in years) |  |  | 7.57 |
Weighted-average operating leases discount rate |  |  | 5.0 | %
Outstanding Lease Assets and Liabilities | The following table summarizes the Company's outstanding lease assets and liabilities and their classification on the Consolidated Balance Sheet:
(millions of dollars) | Balance Sheet Classification |  | December 31, 2019 |
Right-of-use asset | Other assets and deferred charges |  | $ | 44.8 |
Lease liability - current | Other current liabilities |  |  | 11.9 |
Lease liability - non-current | Other non-current liabilities |  |  | 43.3 |
Future Minimum Lease Payments | Future minimum lease payments under the Company's operating leases as of December 31, 2019 were as follows:
(millions of dollars) |  | December 31, 2019 |
2020 |  | $ | 14.3 |
2021 |  |  | 10.8 |
2021 |  |  | 8.5 |
2023 |  |  | 6.6 |
2024 |  |  | 5.2 |
Thereafter |  |  | 21.4 |
Total future minimum lease payments |  |  | 66.8 |
Less imputed interest |  |  | (11.6 | )
Total |  | $ | 55.2 |
Minimum Lease Payments under Non-cancellable Operating Lease | As of December 31, 2018, minimum lease payments under non-cancellable operating leases were expected to be as follows:
(millions of dollars) |  | December 31, 2018 |
2019 |  | $ | 17.3 |
2020 |  |  | 13.0 |
2021 |  |  | 9.5 |
2022 |  |  | 8.2 |
2023 |  |  | 7.0 |
Thereafter |  |  | 24.8 |
Total |  | $ | 79.8 |
Summary of Rent Expense | A summary of rent expense for the fiscal years ended December 31, 2018 and December 31, 2017 was as follows:
(millions of dollars) |  | December 31, 2018 |  |  | December 31, 2017 |
Rent expense |  | $ | 19.5 |  |  | $ | 19.3 |

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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