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Summary Of Significant Accounting Policies - Amortized Cost by Credit Quality (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | $ 158.3 |
2019 | 66.5 |
2018 | 32.1 |
2017 | 12.1 |
2016 | 4.8 |
Prior | 1.2 |
Subtotal | 275.0 | $ 181.8
High |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 78.0 |
2019 | 36.4 |
2018 | 12.2 |
2017 | 7.8 |
2016 | 1.5 |
Prior | 1.2 |
Subtotal | 137.1 |
Moderate |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 74.6 |
2019 | 30.1 |
2018 | 18.8 |
2017 | 3.6 |
2016 | 2.0 |
Prior | 0.0 |
Subtotal | 129.1 |
Low |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 5.7 |
2019 | 0.0 |
2018 | 1.1 |
2017 | 0.7 |
2016 | 1.3 |
Prior | 0.0 |
Subtotal | $ 8.8 |

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- Definition Amount of net investment in sales-type lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919379-209981 + Details
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- Definition Amount of net investment in sales-type lease originated five or more years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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- Definition Amount of net investment in sales-type lease originated four years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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- Definition Amount of net investment in sales-type lease originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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- Definition Amount of net investment in sales-type lease originated three years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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- Definition Amount of net investment in sales-type lease originated two years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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