Leases (Tables)

12 Months Ended

Dec. 31, 2017

Rent expense for the three years ended December 31, 2017 was (in millions):



	2017			2016			2015
Office base rent	$	336.7		$	339.7		$	342.5
Third party sublease rent	(6.3		)	(5.6		)	(11.0		)
Net office rent	330.4			334.1			331.5
Equipment rent	20.1			21.0			22.6
	$	350.5		$	355.1		$	354.1

Future Minimum Lease Payments Under Non-Cancelable Operating and Capital Leases

The aggregate minimum lease payments under non-cancelable operating leases, reduced by third party sublease rent receivable from existing non-cancelable subleases, and capital leases are (in millions):



	Operating Leases			Capital Leases
2018	$	317.8		$	34.5
2019	249.7			30.0
2020	198.3			26.4
2021	169.4			17.1
2022	144.2			6.4
Thereafter	627.2			3.1
Total	1,706.6			117.5
Sublease rent	(19.0		)
Net operating lease payments	$	1,687.6
Interest component				(7.0		)
Present value of minimum capital lease payments				$	110.5

Property Under Capital Lease and Capital Lease Obligations

Property under capital lease and capital lease obligations at December 31, 2017 and 2016 were (in millions):



	2017			2016
Property under capital lease:
Cost	$	229.3		$	184.8
Accumulated depreciation	(121.0		)	(110.2		)
	$	108.3		$	74.6
Capital lease obligations:
Current	$	31.6		$	24.2
Long-term	78.9			49.8
	$	110.5		$	74.0