Current Expected Credit Losses ("CECL") - Delinquency Status of Receivables (Details) $ in Millions	Jun. 30, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Financing receivables	$ 78.4
Current
Financing Receivable, Past Due [Line Items]
Financing receivables	75.5
30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.2
60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.1
90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.1
120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	2.5
Notes receivable, short-term
Financing Receivable, Past Due [Line Items]
Financing receivables	8.2
Notes receivable, short-term | Current
Financing Receivable, Past Due [Line Items]
Financing receivables	5.3
Notes receivable, short-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.2
Notes receivable, short-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.1
Notes receivable, short-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.1
Notes receivable, short-term | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	2.5
Notes receivable, long-term
Financing Receivable, Past Due [Line Items]
Financing receivables	12.0
Notes receivable, long-term | Current
Financing Receivable, Past Due [Line Items]
Financing receivables	12.0
Notes receivable, long-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Notes receivable, long-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Notes receivable, long-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Notes receivable, long-term | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Lease Receivables
Financing Receivable, Past Due [Line Items]
Financing receivables	18.9
Lease Receivables | Current
Financing Receivable, Past Due [Line Items]
Financing receivables	18.9
Lease Receivables | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Lease Receivables | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Lease Receivables | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Lease Receivables | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Equipment Notes
Financing Receivable, Past Due [Line Items]
Financing receivables	37.5
Equipment Notes | Current
Financing Receivable, Past Due [Line Items]
Financing receivables	37.5
Equipment Notes | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Equipment Notes | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Equipment Notes | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Equipment Notes | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Other
Financing Receivable, Past Due [Line Items]
Financing receivables	1.8
Other | Current
Financing Receivable, Past Due [Line Items]
Financing receivables	1.8
Other | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Other | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Other | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivables	0.0
Other | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivables	$ 0.0