Investments (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2018
Other (income) expense, net
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method, other expense (income)		$ 6.1	$ 4.4
Equity securities, equity method, other expense (income)		(0.7)	$ 0.2
Prepaid expenses and other current assets
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method		3.7		$ 9.4
Other non-current assets
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method	[1]	3.7		4.4
Equity securities, equity method, other non-current assets		$ 15.8		$ 15.1
Retained Earnings (Accumulated Deficit) | ASU 2016-01
Schedule of Equity Method Investments [Line Items]
Reclassification to retained earnings					$ 1.0

[1] (1) Measured at fair value using the Net Asset Value practical expedient.