Current Expected Credit Losses - Delinquency Status of Receivables (Details) $ in Millions	Mar. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items]
Current	$ 94.1
Total	115.5
30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.4
60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.2
90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
120 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	20.8
Notes receivable, short-term
Financing Receivable, Past Due [Line Items]
Current	4.3
Total	5.5
Notes receivable, short-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.1
Notes receivable, short-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.1
Notes receivable, short-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Notes receivable, short-term | 120 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	1.0
Notes receivable, long-term
Financing Receivable, Past Due [Line Items]
Current	4.9
Total	24.2
Notes receivable, long-term | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Notes receivable, long-term | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Notes receivable, long-term | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Notes receivable, long-term | 120 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	19.3
Lease Receivables
Financing Receivable, Past Due [Line Items]
Current	31.0
Total	31.2
Lease Receivables | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.2
Lease Receivables | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Lease Receivables | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
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	53.5
Total	54.2
Equipment Notes | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.1
Equipment Notes | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.1
Equipment Notes | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Equipment Notes | 120 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.5
Other (1)
Financing Receivable, Past Due [Line Items]
Current	0.4
Total	0.4
Other (1) | 30-59 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other (1) | 60-89 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other (1) | 90-119 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	0.0
Other (1) | 120 days
Financing Receivable, Past Due [Line Items]
Financing receivable, past due	$ 0.0