Summary Of Significant Accounting Policies - Amortized Cost Basis By Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2023	$ 78.7
2022	126.2
2021	106.9
2020	47.4
2019	11.0
Prior	1.4
Subtotal	371.6	$ 435.0
High
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2023	39.6
2022	70.2
2021	60.3
2020	24.4
2019	6.5
Prior	0.2
Subtotal	201.2
Moderate
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2023	37.6
2022	51.4
2021	43.1
2020	22.2
2019	4.5
Prior	1.0
Subtotal	159.8
Low
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]
2023	1.5
2022	4.6
2021	3.5
2020	0.8
2019	0.0
Prior	0.2
Subtotal	$ 10.6

Amount, before allowance for credit loss, of net investment in sales-type lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Amount of net investment in sales-type lease originated more than five years prior to current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

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