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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2020	$ 98.1
2019	72.8
2018	36.6
2017	14.7
2016	6.3
Prior	1.8
Net investment in sales-type leases	230.3	$ 181.8
High
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2020	43.1
2019	37.0
2018	14.6
2017	7.9
2016	2.4
Prior	1.4
Net investment in sales-type leases	106.4
Moderate
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2020	48.4
2019	34.8
2018	21.6
2017	6.8
2016	2.9
Prior	0.4
Net investment in sales-type leases	114.9
Low
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2020	6.6
2019	1.0
2018	0.4
2017	0.0
2016	1.0
Prior	0.0
Net investment in sales-type leases	$ 9.0

X

- 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

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+ References

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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

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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

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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

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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

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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

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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

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