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Supplementary Data (Tables)
 3 Months Ended
Mar. 31, 2018
Supplementary Data [Abstract]  
Accrued Liabilities
The following table presents the components of accrued liabilities.
 
March 31,
2018
 
December 31,
2017
Salaries, benefits and related expenses
$
300.1

 
$
441.7

Office and related expenses
51.9

 
53.2

Acquisition obligations
43.4

 
42.0

Interest
14.6

 
16.4

Other
118.1

 
121.4

Total accrued liabilities
$
528.1

 
$
674.7
Other Income (Expense), Net
Results of operations for the three months ended March 31, 2018 and 2017 include certain items that are not directly associated with our revenue-producing operations.
 
Three months ended
March 31,
 
2018
 
2017
Net (losses) gains on sales of businesses
$
(24.4
)
 
$
0.9

Other
0.0

 
(0.1
)
Total other (expense) income, net
$
(24.4
)
 
$
0.8
Share Repurchase Program
The following table presents our share repurchase activity under our share repurchase programs for the three months ended March 31, 2018 and 2017.
 
Three months ended
March 31,
 
2018
 
2017
Number of shares repurchased
2.4

 
2.3

Aggregate cost, including fees
$
54.9

 
$
55.0

Average price per share, including fees
$
22.59

 
$
23.85
Redeemable Noncontrolling Interest
The following table presents changes in our redeemable noncontrolling interests.
 
Three months ended
March 31,
 
2018
 
2017
Balance at beginning of period
$
252.1

 
$
252.8

Change in related noncontrolling interests balance
(2.8
)
 
(4.5
)
Changes in redemption value of redeemable noncontrolling interests:
 
 
 
Redemptions and other
(1.9
)
 
(12.7
)
Redemption value adjustments
(0.5
)
 
5.6

Balance at end of period
$
246.9

 
$
241.2