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Supplementary Data (Tables)
 6 Months Ended
Jun. 30, 2017
Supplementary Data [Abstract]  
Accrued Liabilities
The following table presents the components of accrued liabilities.
 
June 30,
2017
 
December 31,
2016
Salaries, benefits and related expenses
$
301.4

 
$
499.0

Acquisition obligations
56.8

 
77.5

Office and related expenses
45.4

 
46.7

Interest
17.1

 
17.3

Other
92.4

 
153.5

Total accrued liabilities
$
513.1

 
$
794.0
Other Income (Expense), Net
Results of operations for the three and six months ended June 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations.
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2017
 
2016
 
2017
 
2016
Net losses on sales of businesses and investments
$
(13.1
)
 
$
(2.2
)
 
$
(12.1
)
 
$
(18.5
)
Other (expense) income, net
(2.3
)
 
2.6

 
(2.5
)
 
(0.3
)
Total other (expense) income, net
$
(15.4
)
 
$
0.4

 
$
(14.6
)
 
$
(18.8
)
Share Repurchase Program
The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2017 and 2016.
 
Six months ended
June 30,
 
2017
 
2016
Number of shares repurchased
4.8

 
5.0

Aggregate cost, including fees
$
115.0

 
$
112.5

Average price per share, including fees
$
24.13

 
$
22.47