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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Net Rent Expense
Net rent expense is listed in the table below.
 
Years ended December 31,
 
2011
 
2010
 
2009
Gross rent expense
$
369.5

 
$
365.2

 
$
391.5

Third-party sublease rental income
(19.4
)
 
(20.0
)
 
(26.8
)
Net rent expense
$
350.1

 
$
345.2

 
$
364.7
Schedule of Future Minimum Lease Commitments
Cash amounts for future minimum lease commitments for office premises and equipment under non-cancelable leases, along with minimum sublease rental income to be received under non-cancelable subleases, are listed in the table below.
Period
Rent
Obligations
 
Sublease Rental
Income
 
Net Rent
2012
$
313.1

 
$
(26.9
)
 
$
286.2

2013
277.1

 
(26.0
)
 
251.1

2014
224.0

 
(13.9
)
 
210.1

2015
186.5

 
(6.1
)
 
180.4

2016
147.1

 
(1.4
)
 
145.7

Thereafter
487.9

 
(0.8
)
 
487.1

Total
$
1,635.7

 
$
(75.1
)
 
$
1,560.6
Schedule of Contingent Acquisition Obligations
The following table details the estimated future contingent acquisition obligations payable in cash as of December 31, 2011.
 
 
2012
 
2013
 
2014
 
2015
 
2016
 
Thereafter
 
Total
Deferred acquisition payments
 
$
40.7

 
$
13.6

 
$
14.5

 
$
5.9

 
$
29.3

 
$
16.6

 
$
120.6

Redeemable noncontrolling interests and call options with affiliates 1
 
15.6

 
53.4

 
22.8

 
26.5

 
4.0

 
6.7

 
129.0

Total contingent acquisition payments
 
56.3

 
67.0

 
37.3

 
32.4

 
33.3

 
23.3

 
249.6

Less: cash compensation expense included above
 
3.6

 
0.3

 
0.2

 
0.2

 
0.0

 
0.0

 
4.3

Total
 
$
52.7

 
$
66.7

 
$
37.1

 
$
32.2

 
$
33.3

 
$
23.3

 
$
245.3

 
1 
We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. In such instances, we have included the related estimated contingent acquisition obligation in the period when the earliest related option is exercisable. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2011. These estimated acquisition payments of $4.6 have been included within the total payments expected to be made in 2012 in the table. If not made in 2012, they will continue to carry forward into 2013 or beyond until they are exercised or expire. Redeemable noncontrolling interests are included in the table at current exercise price payable in cash, not at applicable redemption value in accordance with the authoritative guidance for classification and measurement of redeemable securities.