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RECENT ACCOUNTING PRONOUNCEMENTS Adoption of ASU 2017-07 (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Standards Update 2017-07 [Member]  
Error Corrections and Prior Period Adjustments Restatement [Line Items]  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block] As a result of the adoption, our Consolidated Statement of Operations for the three and six months ended June 30, 2017 was restated as follows:
For the Three Months Ended June 30, 2017
Previously Reported
Effect of Change
Restated
Costs of revenue
 
$
426.5

 
 
$
(0.6
)
 
 
$
425.9

 
General and administrative expenses
 
65.3

 
 
(0.7
)
 
 
64.6

 
Sales and marketing expenses
 
43.9

 
 
(0.1
)
 
 
43.8

 
Operating income
 
57.7

 
 
1.4

 
 
59.1

 
Interest and non-operating (income) expenses, net
 
(0.9
)
 
 
1.4

 
 
0.5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the Six Months Ended June 30, 2017
Previously Reported
Effect of Change
Restated
Costs of revenue
 
$
850.0

 
 
$
(1.4
)
 
 
$
848.6

 
General and administrative expenses
 
131.5

 
 
(1.2
)
 
 
130.3

 
Sales and marketing expenses
 
87.0

 
 
(0.1
)
 
 
86.9

 
Research and development expenses
 
45.1

 
 
(0.1
)
 
 
45.0

 
Operating income
 
113.3

 
 
2.8

 
 
116.1

 
Interest and non-operating (income) expenses, net
 
(0.1
)
 
 
2.8

 
 
2.7