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Supplementary Data (Tables)
 9 Months Ended
Sep. 30, 2017
Supplementary Data [Abstract]  
Accrued Liabilities
The following table presents the components of accrued liabilities.
 
September 30,
2017
 
December 31,
2016
Salaries, benefits and related expenses
$
341.3

 
$
499.0

Acquisition obligations
53.2

 
77.5

Office and related expenses
48.8

 
46.7

Interest
17.0

 
17.3

Other
90.4

 
153.5

Total accrued liabilities
$
550.7

 
$
794.0
Other (Expense) Income, Net
Results of operations for the three and nine months ended September 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations.
 
Three months ended
September 30,
 
Nine months ended
September 30,
 
2017
 
2016
 
2017
 
2016
Net (losses) gains on sales of businesses and investments
$
(6.2
)
 
$
3.9

 
$
(18.3
)
 
$
(14.6
)
Other (expense) income, net
(3.7
)
 
1.4

 
(6.2
)
 
1.1

Total other (expense) income, net
$
(9.9
)
 
$
5.3

 
$
(24.5
)
 
$
(13.5
)
Share Repurchase Program
The following table presents our share repurchase activity under our share repurchase programs for the nine months ended September 30, 2017 and 2016.
 
Nine months ended
September 30,
 
2017
 
2016
Number of shares repurchased
9.4

 
8.5

Aggregate cost, including fees
$
216.0

 
$
193.3

Average price per share, including fees
$
22.92

 
$
22.69