Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies Disclosure [Abstract]

Schedule of Net Rent Expense

Net rent expense is listed in the table below.

	Years ended December 31,
	2014			2013			2012
Gross rent expense	$	357.7		$	366.1		$	358.5
Third-party sublease rental income	(6.1		)	(16.1		)	(17.5		)
Net rent expense	$	351.6		$	350.0		$	341.0

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
2015	$	328.4	$	(8.4	)	$	320.0
2016	288.9		(2.8		)	286.1
2017	248.3		(1.1		)	247.2
2018	222.3		(0.1		)	222.2
2019	198.9		0.0			198.9
Thereafter	845.1		0.0			845.1
Total	$	2,131.9	$	(12.4	)	$	2,119.5

Schedule of Contingent Acquisition Obligations

The following table details the estimated future contingent acquisition obligations payable in cash as of December 31, 2014.

	2015		2016		2017		2018		2019		Thereafter		Total
Deferred acquisition payments	$	60.3	$	21.3	$	49.1	$	7.9	$	10.8	$	0.9	$	150.3
Redeemable noncontrolling interests and call options with affiliates 1	35.4		65.0		37.0		7.8		10.5		7.0		162.7
Total contingent acquisition payments	95.7		86.3		86.1		15.7		21.3		7.9		313.0
Less: cash compensation expense included above	1.9		1.6		0.7		0.0		0.0		0.0		4.2
Total	$	93.8	$	84.7	$	85.4	$	15.7	$	21.3	$	7.9	$	308.8

1 We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. The estimated amounts listed would be paid in the event of exercise at the earliest exercise date. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2014. These estimated payments of $20.5 are included within the total payments expected to be made in 2015, and will continue to be carried forward into 2016 or beyond until exercised or expired. 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.