Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of properties and related accumulated depreciation

Property and equipment and related accumulated depreciation are as follows (in millions):

	December 31,
	2017		2016
Land	$	52.9	$	34.2
Buildings	198.0		160.3
Technology equipment	248.4		213.0
Software	591.4		508.2
Furniture, fixtures and other equipment	151.6		122.1
Leasehold improvements	91.6		76.4
Construction-in-progress	12.1		18.3
	1,346.0		1,132.5
Less accumulated depreciation and amortization	996.2		896.8
Properties, net	$	349.8	$	235.7

Summary of software development and maintenance costs

Software assets are comprised of the following (in millions):

	December 31, 2017				December 31, 2016
	Carrying Amount		Accumulated Amortization		Carrying Amount		Accumulated Amortization
Internally developed software	$	324.0	$	287.9	$	296.4	$	266.0
Purchased software	183.8		159.5		155.3		143.0
Software from business acquisitions	83.6		52.8		56.5		44.5
Total	$	591.4	$	500.2	$	508.2	$	453.5