Debt and Credit Facilities (Components Of Debt) (Details)	Jul. 03, 2020 USD ($)	Jul. 03, 2020 EUR (€)	May 21, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 20, 2019 USD ($)	Sep. 20, 2019 EUR (€)
Debt Instrument [Line Items]
Total debt	$ 1,975,700,000			$ 1,324,900,000
Less: current portion	(253,500,000)			(3,900,000)
Long-term debt	1,722,200,000			1,321,000,000.0
Senior term loan facility due 2022 ($650.0 million aggregate principal amount) (the “Term Loan Facility”), net of deferred debt issuance costs of $2.3 million and $1.3 million, respectively
Debt Instrument [Line Items]
Term loan	650,000,000				$ 650,000,000
Debt issuance costs	2,300,000			1,300,000
Total debt	647,700,000			648,700,000	$ 650,000,000
Senior euro term loan facility due 2022 (€600.0 million aggregate principal amount) (the “Euro Term Loan Facility”), net of deferred debt issuance costs of $1.7 million and $0.9 million, respectively
Debt Instrument [Line Items]
Term loan | €		€ 600,000,000				€ 600,000,000
Debt issuance costs	1,700,000			900,000
Total debt	673,200,000			672,000,000.0
Senior multi-currency revolving credit facility ($250.0 million borrowing capacity) (the “Revolving Credit Facility”)
Debt Instrument [Line Items]
Revolving credit facility maximum borrowing capacity	250,000,000
Total debt	249,800,000			0
Other
Debt Instrument [Line Items]
Total debt	3,800,000			4,200,000
Convertible Debt | Convertible senior notes, net of deferred debt issuance costs of $11.7 million and unamortized discount of $104.6 million
Debt Instrument [Line Items]
Term loan			$ 518,000,000
Debt issuance costs	11,700,000		$ 12,000,000
Unamortized discount	104,600,000
Interest rate			2.375%
Total debt	$ 401,200,000		$ 411,000,000	$ 0