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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases [Abstract] |
Lease, Cost [Table Text Block] | Components of lease expense for the year ended December 31, 2020 and 2019 were as follows (in millions):
|  | 2020 |  | 2019
Operating lease expense |  | $ | 32.9 |  |  | $ | 32.1 |
Short-term lease expense |  | 6.6 |  |  | 2.1 |
Variable lease expense |  | 6.4 |  |  | 5.8 |
Total lease expense |  | $ | 45.9 |  |  | $ | 40.0 |
Lessee, Operating Lease, Disclosure | Supplemental information related to leases for December 31, 2020 and 2019 (in millions):
|  | 2020 |  | 2019
Weighted-average remaining lease term of operating leases |  | 3.7 years |  | 4.2 years
Weighted-average discount rate of operating leases |  | 3.91 | % |  | 4.26 | %
Cash paid for operating lease liabilities |  | $ | 34.0 |  | $ | 32.1
Lessee, Operating Lease, Liability, Maturity [Table Text Block] | Maturities of operating lease liabilities at December 31, 2020 (in millions):
2021 |  | $ | 32.4 |
2022 |  | 25.9 |
2023 |  | 20.1 |
2024 |  | 12.7 |
2025 |  | 5.4 |
Thereafter |  | 2.7 |
Total future minimum lease payments |  | 99.2 |
Less: imputed interest |  | 6.9 |
Total operating lease liabilities |  | $ | 92.3 |

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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 for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 + Details
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