Computer Software (Tables)

12 Months Ended

Dec. 31, 2018

Research and Development [Abstract]

Schedule of Capitalized Software

Computer software, net consists of the following (in millions):

	December 31,
	2018			2017
Internally developed software	$	746.0		$	679.4
Purchased software	60.7			45.7
Computer software	806.7			725.1
Accumulated amortization	(401.1		)	(308.3		)
Computer software, net	$	405.6		$	416.8

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated amortization expense on computer software for the next five fiscal years is as follows (in millions):

2019 (1)	$	93.6
2020	92.5
2021	77.8
2022	68.0
2023	59.4

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(1) Assumes assets not in service as of December 31, 2018 are placed in service equally throughout the year.

Estimated amortization expense on other intangible assets for the next five fiscal years is as follows (in millions):

2019	$	58.2
2020	47.2
2021	36.3
2022	25.2
2023	14.2