Current Expected Credit Losses - Delinquency Status of Receivables (Details) $ in Millions	Jun. 30, 2020 USD ($)
Financing Receivable, Past Due [Line Items]
Current	$ 54.7
Total	106.8
30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	17.6
60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	28.9
90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	4.0
120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.6
Notes receivable, short-term
Financing Receivable, Past Due [Line Items]
Current	4.1
Total	6.1
Notes receivable, short-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.3
Notes receivable, short-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.4
Notes receivable, short-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.1
Notes receivable, short-term | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.2
Notes receivable, long-term
Financing Receivable, Past Due [Line Items]
Current	19.5
Total	23.2
Notes receivable, long-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.2
Notes receivable, long-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.9
Notes receivable, long-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.6
Notes receivable, long-term | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Lease Receivables
Financing Receivable, Past Due [Line Items]
Current	10.3
Total	26.3
Lease Receivables | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	5.5
Lease Receivables | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	9.4
Lease Receivables | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.1
Lease Receivables | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Equipment Notes
Financing Receivable, Past Due [Line Items]
Current	19.6
Total	50.0
Equipment Notes | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	10.6
Equipment Notes | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	17.2
Equipment Notes | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	2.2
Equipment Notes | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.4
Other
Financing Receivable, Past Due [Line Items]
Current	1.2
Total	1.2
Other | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other | 120+ days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	$ 0.0