Fair Value Measurements (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
	Mar. 27, 2020	Sep. 25, 2020	Mar. 27, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment without readily determinable fair value		$ 49.0			$ 49.0
Impairment of goodwill		0.0	$ 85.3	$ 0.0	85.3	$ 0.0
Telematics
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of goodwill	$ 85.3
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liabilities		15.6			15.6		$ 14.7
Fair Value, Measurements, Recurring | Quoted Prices in Active Market (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liabilities		0.0			0.0		0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liabilities		15.6			15.6		14.7
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation liabilities		$ 0.0			$ 0.0		$ 0.0