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Accounts receivable (Tables)
12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Schedule of Receivables Under Sales-Type Lease
As of December 31, 2017, receivables under sales-type leases before the allowance for unearned income were collectible as follows:
Year
 
2018
$
45.5

2019
25.8

2020
16.3

2021
10.8

2022
9.7

Thereafter
19.1

Total
$
127.2