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Supplementary Data (Tables)
 9 Months Ended
Sep. 30, 2018
Supplementary Data [Abstract]  
Accrued Liabilities
The following table presents the components of accrued liabilities.
 
September 30,
2018
 
December 31,
2017
Salaries, benefits and related expenses
$
340.1

 
$
441.7

Acquisition obligations
52.3

 
42.0

Office and related expenses
49.4

 
53.2

Interest
19.0

 
16.4

Other
110.2

 
121.4

Total accrued liabilities
$
571.0

 
$
674.7
Other Income (Expense), Net
Results of operations for the three and nine months ended September 30, 2018 and 2017 include certain items that are not directly associated with our revenue-producing operations.
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2018
 
2017
 
2018
 
2017
Net losses on sales of businesses
$
(5.8
)
 
$
(8.7
)
 
$
(50.0
)
 
$
(20.9
)
Other
(9.5
)
 
(1.2
)
 
(6.0
)
 
(3.6
)
Total other expense, net
$
(15.3
)
 
$
(9.9
)
 
$
(56.0
)
 
$
(24.5
)
Share Repurchase Program
The following table presents our share repurchase activity under our share repurchase programs for the nine months ended September 30, 2018 and 2017.
 
Nine months ended
September 30,
 
2018
 
2017
Number of shares repurchased
5.1

 
9.4

Aggregate cost, including fees
$
117.1

 
$
216.0

Average price per share, including fees
$
23.03

 
$
22.92