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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | $ 75.3 |
2019 | 86.0 |
2018 | 42.6 |
2017 | 18.4 |
2016 | 7.9 |
Prior | 2.7 |
Net investment in sales-type leases | 232.9 | $ 191.9
High |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 41.3 |
2019 | 51.6 |
2018 | 18.7 |
2017 | 10.0 |
2016 | 3.1 |
Prior | 2.6 |
Net investment in sales-type leases | 127.3 |
Moderate |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 30.4 |
2019 | 34.4 |
2018 | 22.1 |
2017 | 7.5 |
2016 | 2.5 |
Prior | 0.1 |
Net investment in sales-type leases | 97.0 |
Low |  |
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items] |  |
2020 | 3.6 |
2019 | 0.0 |
2018 | 1.8 |
2017 | 0.9 |
2016 | 2.3 |
Prior | 0.0 |
Net investment in sales-type leases | $ 8.6 |

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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 in fiscal year 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 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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