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Recent Accounting Pronouncements Adoption of ASU 2017-07 (Tables)
 12 Months Ended
Dec. 31, 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 2017 and 2016 was restated as follows:
For the Year Ended December 31, 2017
Previously Reported
Effect of Change
Restated
Costs of revenue
 
$
1,768.1

 
 
$
(2.7
)
 
 
$
1,765.4

 
General and administrative expenses(a)
 
264.9

 
 
(6.5
)
 
 
258.4

 
Sales and marketing expenses
 
169.7

 
 
(0.2
)
 
 
169.5

 
Research and development expenses
 
93.7

 
 
(0.2
)
 
 
93.5

 
Operating income
 
309.7

 
 
9.6

 
 
319.3

 
Interest and non-operating expenses, net
 
0.3

 
 
9.6

 
 
9.9

 
 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31, 2016
Previously Reported
Effect of Change
Restated
Costs of revenue
 
$
1,647.2

 
 
$
(2.7
)
 
 
$
1,644.5

 
General and administrative expenses(a)
 
275.0

 
 
(14.5
)
 
 
260.5

 
Sales and marketing expenses
 
170.0

 
 
(0.2
)
 
 
169.8

 
Research and development expenses
 
80.8

 
 
(0.3
)
 
 
80.5

 
Operating income
 
258.9

 
 
17.7

 
 
276.6

 
Interest and non-operating expenses, net
 
0.5

 
 
17.7

 
 
18.2

 
(a)
Previously reported General and administrative expenses of $0.9 have been reclassed to conform with current year presentation for the years ended December 31, 2017 and 2016, respectively, related to gains on the sale of long-lived assets.