Allowance for Credit Losses (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for credit losses (Textuals)
Allowance for credit losses, individually evaluated for impairment	$ 0.3	$ 4.4
Minimum
Allowance for credit losses (Textuals)
Period required for considering financing receivable as non accrual status	60 days
Period for placing financing receivables on non-accrual status	89 days
Past Due Period Of Financing Receivable Accruing Interest	90 days
Maximum
Allowance for credit losses (Textuals)
Period required for considering financing receivable as non accrual status	89 days
Finance Leases Financing Receivable [Member]
Allowance for credit losses (Textuals)
Individually evaluated for impairment	$ 35.9	26.3
Allowance for credit losses	0.4	0.3
Notes Receivable [Member]
Allowance for credit losses (Textuals)
Individually evaluated for impairment	$ 4.9	$ 16.0