Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Future minimum payments under non-cancelable leases, sublease commitments and related party

We lease office space, furniture and office equipment under various operating leases. The future minimum payments under non-cancelable leases, sublease commitments and related payments we are obligated to make, net of sublease commitments of third party lessees to make payments to us, as of December 31, 2012 are as follows:

	Payments		Sublease Receipts		Net Payments
	(in millions)
2013	$	139.4	$	22.3	$	117.1
2014		136.0		24.4		111.6
2015		136.2		24.4		111.8
2016		135.6		24.4		111.2
2017		136.9		24.8		112.1
2018 and thereafter		1,084.4		137.1		947.3
Total future minimum payments	$	1,768.5	$	257.4	$	1,511.1