Otherr Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Other intangible assets, net consists of the following (in millions):

	December 31, 2018							December 31, 2017
	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships	$	568.0	$	(382.8	)	$	185.2	$	555.9	$	(326.0	)	$	229.9
Other	6.9		(4.1		)	2.8		5.3		(3.6		)	1.7
Total intangible assets	$	574.9	$	(386.9	)	$	188.0	$	561.2	$	(329.6	)	$	231.6

Schedule of Indefinite-Lived Intangible Assets

Other intangible assets, net consists of the following (in millions):

	December 31, 2018							December 31, 2017
	Gross carrying amount		Accumulated amortization			Net carrying amount		Gross carrying amount		Accumulated amortization			Net carrying amount
Customer relationships	$	568.0	$	(382.8	)	$	185.2	$	555.9	$	(326.0	)	$	229.9
Other	6.9		(4.1		)	2.8		5.3		(3.6		)	1.7
Total intangible assets	$	574.9	$	(386.9	)	$	188.0	$	561.2	$	(329.6	)	$	231.6

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