Investments (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
ASU 2016-01
Schedule of Equity Method Investments [Line Items]
Reclassification from OCI						$ 1.0
Other (income) expense, net
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method, other expense (income)		$ 0.9	$ 0.0	$ 11.6	$ 0.0
Equity securities, equity method, other expense (income)		(1.0)	$ 0.1	(1.6)	$ (0.2)
Prepaid expenses and other current assets
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method		7.0		7.0
Equity securities, fair value method, previous year	[1]					17.0
Other non-current assets
Schedule of Equity Method Investments [Line Items]
Equity securities, fair value method	[2]	4.8		4.8
Equity securities, fair value method, previous year	[1]					6.3
Equity securities, equity method, other non-current assets		$ 14.1		14.1		4.9	[1]
Retained Earnings | ASU 2016-01
Schedule of Equity Method Investments [Line Items]
Reclassification to retained earnings						$ 1.0
Zibo Xinhua
Schedule of Equity Method Investments [Line Items]
Increase in investment in Zibo Xinhua				$ 7.5

[1] The December 31, 2017 balances presented reflect historical recognition and measurement investment categories existing prior to the adoption of ASU 2016-01, which include available for sale and cost method securities.

[2] The September 29, 2018 equity securities are measured at fair value using the Net Asset Value practical expedient.