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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Components of Lease Expense and Supplemental Cash Flow Information | The components of lease expense were as follows (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Operating lease expense | $ | 26.5 |  |  | $ | 18.5 |  |  | $ | 15.3 |
Variable lease expense (1) | 3.1 |  |  | 2.3 |  |  | 2.6 |
Short-term lease expense | 3.7 |  |  | 3.8 |  |  | 3.2 |
Total lease expense | $ | 33.3 |  |  | $ | 24.6 |  |  | $ | 21.1 |
(1) Variable lease expense for the year ended December 31, 2021, 2020 and 2019 predominantly included common area maintenance charges and parking expense.
Supplemental cash flow information related to leases was as follows (in millions):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Cash paid for amounts included in the measurement of lease liabilities |  |  |  |  |
Operating cash flows used for operating leases | $ | 25.8 |  |  | $ | 18.9 |  |  | $ | 16.2 |
Supplemental Balance Sheet Information | Supplemental balance sheet information related to our operating leases was as follows (in millions, except lease term and discount rate):
| Classification |  | December 31, 2021 |  | December 31, 2020
Operating lease ROU assets – non-current | Other assets |  | $ | 65.1 |  |  | $ | 49.3 |
Operating lease liabilities – current | Accrued liabilities |  | $ | 26.3 |  |  | $ | 19.1 |
Operating lease liabilities – non-current | Other liabilities |  | 40.5 |  |  | 34.0 |
Total operating lease liabilities |  |  | $ | 66.8 |  |  | $ | 53.1 |
Weighted average remaining lease term in years – operating leases |  |  | 3.0 |  | 3.5
Weighted average discount rate – operating leases |  |  | 2.1 | % |  | 3.2 | %
Maturities of Operating Lease Liabilities | Maturities of operating lease liabilities as of December 31, 2021 were as follows (in millions):
Year Ending December 31, | Amount
2022 | $ | 27.3 |
2023 | 20.5 |
2024 | 14.0 |
2025 | 5.1 |
2026 | 1.6 |
Thereafter | 0.4 |
Total lease payments | $ | 68.9 |
Less imputed interest | (2.1) |
Total | $ | 66.8 |

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- Definition Assets And Liabilities, Lessee [Table Text Block] + References No definition available. + Details
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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=123408670&loc=SL77918686-209980 + Details
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- References No definition available. + 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=123408670&loc=SL77918701-209980 + Details
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