Current Expected Credit Losses - Year of Origination of Financing Receivables (Details) $ in Millions	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 3.4
2019	8.7
2018	12.8
2017	6.3
2016	1.3
Prior	71.7
Total	104.2
Notes receivable, short-term
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1.9
2019	7.8
2018	12.8
2017	6.3
2016	0.0
Prior	0.1
Total	28.9
Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1.5
2019	0.9
2018	0.0
2017	0.0
2016	1.3
Prior	21.8
Total	25.5
Equipment Notes
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
Prior	49.8
Total	$ 49.8