Allowance for Credit Losses (Tables)
 3 Months Ended
Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]  
Allowance for credit losses
The following table summarizes the Company’s allowance for credit losses for the three months ended March 31, 2015 and 2014:

 
 
Finance
Leases
 
Notes
Receivable
 
Total
Allowance for credit losses
 
 
 
 
 
 
Balance at January 1, 2015
 
$
0.4

 
$
4.1

 
$
4.5

Provision for credit losses
 
0.5

 
—

 
0.5

Balance at March 31, 2015
 
$
0.9

 
$
4.1

 
$
5.0

 
 
 
 
 
 
 
Balance at January 1, 2014

$
0.4


$
4.1


$
4.5

Balance at March 31, 2014

$
0.4


$
4.1


$
4.5
Aging of past-due notes receivable
The following table summarizes the Company’s aging of past-due notes receivable balances:
 
 
March 31, 2015
 
December 31, 2014
30-59 days past due
 
$
—

 
$
0.1

60-89 days past due
 
—

 
—

> 89 days past due (1)
 
2.3

 
1.5

Total past due
 
$
2.3

 
$
1.6


(1)
Past-due notes receivable balances greater than 89 days are fully reserved.