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Recent accounting pronouncements and accounting changes (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]  
Schedule of Amounts Reclassified in Consolidated Statements of Cash Flows
Amounts reclassified in the consolidated statements of cash flows for the years ended December 31, 2016 and 2015 are as follows:
Year ended December 31,
2016

 
2015

Cash flows from operating activities
 
 
 
Other assets
$
(1.9
)
2.60

$
2.6

Cash flows from investing activities
 
 
 
Other
1.6

 
(2.3
)
Effect of exchange rate changes on cash, cash equivalents and restricted cash
(0.8
)
 
(4.6
)
Cash, cash equivalents and restricted cash, beginning of year
31.6

 
35.9

Cash, cash equivalents and restricted cash, end of year
30.5

 
31.6