Debt And Credit Facilities - Components Of Debt (Details)	Oct. 01, 2021 USD ($)	Oct. 01, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	May 21, 2020 USD ($)	Sep. 20, 2019 USD ($)	Sep. 20, 2019 EUR (€)
Debt Instrument [Line Items]
Total debt	$ 1,314,500,000		$ 1,794,500,000
Less: current portion	(426,700,000)		(886,800,000)
Long-term debt	887,800,000		907,700,000
US term loan due 2024
Debt Instrument [Line Items]
Term loan						$ 650,000,000.0
Debt issuance costs	2,900,000		1,900,000
Total debt	647,100,000		648,100,000			$ 650,000,000.0
Euro term loan due 2024
Debt Instrument [Line Items]
Term loan | €		€ 208,000,000.0		€ 600,000,000.0			€ 600,000,000.0
Debt issuance costs	500,000		1,300,000
Total debt	240,700,000		731,600,000
Other
Debt Instrument [Line Items]
Total debt	0		3,700,000
Convertible Debt | Convertible senior notes due 2025
Debt Instrument [Line Items]
Term loan					$ 517,500,000
Debt issuance costs	9,400,000		10,800,000		11,900,000
Unamortized discount	81,400,000		95,600,000
Total debt	$ 426,700,000		$ 411,100,000		$ 410,900,000