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Leases (Tables) | 12 Months Ended
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Dec. 31, 2021
Leases [Abstract] |
Lease, Cost | The components of lease expense were as follows:
($ in millions) | 2021 |  | 2020 |  | 2019
Operating lease cost | $ | 12.7 |  |  | $ | 12.8 |  |  | $ | 12.9 |
Short-term lease cost | 1.3 |  |  | 0.8 |  |  | 0.8 |
Variable lease cost | 4.8 |  |  | 3.8 |  |  | 3.3 |
Total lease cost | $ | 18.8 |  |  | $ | 17.4 |  |  | $ | 17.0 |
Cash Flow and Supplemental information | Supplemental information related to leases was as follows:
($ in millions) | 2021 |  | 2020 |  | 2019
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows from operating leases | $ | 12.1 |  |  | $ | 12.6 |  |  | $ | 12.5 |
Right-of-use assets obtained in exchange for new operating lease liabilities | 13.3 |  |  | 6.1 |  |  | 9.1 |
Lessee, Operating Lease, Liability, Maturity | Maturities of lease liabilities as of December 31, 2021 were as follows:
($ in millions) | Operating
Year | Leases
2022 | $ | 11.5 |
2023 | 10.7 |
2024 | 10.0 |
2025 | 8.2 |
2026 | 7.3 |
Thereafter | 38.7 |
| 86.4 |
Less: imputed lease interest | (14.1) |
Total lease liabilities | $ | 72.3 |

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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=123408670&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=123408670&loc=SL77918701-209980 + Details
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- Definition lessee, lease Cash Flow and Supplemental information [Table Text Block] + References No definition available. + Details
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