Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill - Narrative (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
Goodwill - Narrative (Details) - USD ($) $ in Millions	Mar. 27, 2020	Jun. 26, 2020	Mar. 27, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019	Dec. 31, 2019
Goodwill [Line Items]
Impairment of goodwill		$ 0.0		$ 0.0	$ 85.3	$ 0.0
Goodwill		$ 8,297.7			$ 8,297.7		$ 8,399.3
Telematics Reporting Unit
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount							5.00%
Impairment of goodwill	$ 85.3		$ 85.3
Goodwill	$ 235.9		$ 235.9