Leases (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Rent Expense

Rent expense for the three years ended December 31, 2018 was (in millions):

	2018			2017			2016
Office base rent	$	295.0		$	336.7		$	339.7
Third-party sublease rent	(7.2		)	(6.3		)	(5.6		)
Net office rent	287.8			330.4			334.1
Equipment rent	16.6			20.1			21.0
	$	304.4		$	350.5		$	355.1

Aggregate 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
2019	$	327.3		$	41.8
2020	278.2			38.2
2021	226.2			29.3
2022	186.1			15.6
2023	150.9			6.6
Thereafter	663.6			3.9
Total	1,832.3			135.4
Sublease rent	(14.1		)
Net operating lease payments	$	1,818.2
Interest component				(7.9		)
Present value of minimum capital lease payments				$	127.5

Assets Under Capital Lease and Capital Lease Obligations

Assets under capital lease and capital lease obligations at December 31, 2018 and 2017 were (in millions):

	2018			2017
Assets under capital lease:
Cost	$	258.2		$	229.3
Accumulated depreciation	(133.8		)	(121.0		)
	$	124.4		$	108.3
Capital lease obligations:
Current	$	38.6		$	31.6
Long-term	88.9			78.9
	$	127.5		$	110.5