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Supplementary Data (Tables)
 6 Months Ended
Jun. 30, 2016
Supplementary Data [Abstract]  
Accrued Liabilities
Accrued Liabilities
The following table presents the components of accrued liabilities.
 
June 30,
2016
 
December 31,
2015
Salaries, benefits and related expenses
$
333.6

 
$
502.4

Acquisition obligations
68.8

 
50.1

Office and related expenses
43.6

 
51.0

Interest
16.7

 
17.3

Other
125.7

 
139.5

Total accrued liabilities
$
588.4

 
$
760.3
Other (Expense) Income, Net
Results of operations for the three and six months ended June 30, 2016 and 2015 include certain items that are not directly associated with our revenue-producing operations.
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2016
 
2015
 
2016
 
2015
Losses on sales of businesses and investments
$
(2.2
)
 
$
(0.1
)
 
$
(18.5
)
 
$
(0.2
)
Other income, net
2.1

 
0.6

 
1.3

 
1.0

Total other (expense) income, net
$
(0.1
)
 
$
0.5

 
$
(17.2
)
 
$
0.8
Share Repurchase Program
The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2016 and 2015.
 
Six months ended
June 30,
 
2016
 
2015
Number of shares repurchased
5.0

 
4.9

Aggregate cost, including fees
$
112.5

 
$
102.0

Average price per share, including fees
$
22.47

 
$
20.87