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Allowance for Losses (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Changes in the allowance for possible losses
The following table shows changes in the allowance for losses at December 31 (in millions):
 
2017
 
2016
Beginning balance
$
6.1

 
$
10.3

Provision for losses
0.6

 
4.0

Charges to allowance
0.2

 
(9.1
)
Recoveries and other, including foreign exchange adjustments
(0.5
)
 
0.9

Ending balance
$
6.4

 
$
6.1