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Summary of Significant Accounting Policies Leases (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) land_easement
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease right of use assets |  | $ 20.7 | $ 41.4 |
Total Liabilities |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease liabilities |  | $ 35.8 |  |
Accounting Standards Update 2016-02 |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Impairment losses recorded upon adoption of ASU 2016-02 | $ 0.0 |  |  |
Finance lease expense impact of adoption of ASU 2016-02 | $ 0.0 |  |  |
Accounting Standards Update 2016-02 | Total Assets |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease right of use assets |  |  |  | $ 49.0
Accounting Standards Update 2016-02 | Total Liabilities |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease liabilities |  |  |  | $ 48.8
Accounting Standards Update 2018-01 |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Number of land easements treated as leases upon adoption of ASU 2016-02 | land_easement |  |  |  | 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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