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Long-Term Debt - Partial exchange or repurchase of the 1.625% Notes (Details) $ / shares in Units, shares in Millions, $ in Millions				3 Months Ended		9 Months Ended
	Sep. 30, 2021 day	May 19, 2021 day	May 11, 2021 USD ($) shares	Oct. 01, 2021 USD ($)	Oct. 02, 2020 USD ($)	Oct. 01, 2021 USD ($) day $ / shares	Oct. 02, 2020 USD ($)	May 10, 2021	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Loss on debt refinancing and prepayment				$ 0.0	$ 0.0	$ (26.2)	$ 0.0
Partial settlement - 1.625% Notes						(141.6)
Settlement of bond hedges, APIC impact						0.0
Current portion of long-term debt				$ 203.0		203.0			$ 531.6
Additional Paid-in Capital
Debt Instrument [Line Items]
Partial settlement - 1.625% Notes						(141.7)
Settlement of bond hedges, APIC impact						$ 339.0
1.625% Notes Warrants
Debt Instrument [Line Items]
Number of warrants (in shares) | shares			6.8
Convertible Debt | 1.625% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		1.625%	1.625%	1.625%		1.625%		1.625%
Face amount repurchased or exchanged			$ 372.4
Cash consideration for repurchase or exchange of convertible debt			$ 506.5
Equity consideration for repurchase or exchange of convertible debt (in shares) | shares			5.4
Loss on debt refinancing and prepayment			$ 26.2
Partial settlement - 1.625% Notes			141.6
Current portion of long-term debt				$ 187.0		$ 187.0
Threshold trading days | day						20
Threshold consecutive trading days | day	30
Stock price trigger (in dollars per share) | $ / shares						$ 26.94
Threshold percentage of stock price trigger (greater than or equal to)						130.00%
Convertible Debt | 1.625% Notes | Additional Paid-in Capital
Debt Instrument [Line Items]
Settlement of bond hedges, APIC impact			$ 339.0
Convertible Debt | 1.625% Notes | Embedded Derivative Financial Instruments
Debt Instrument [Line Items]
Shares received into treasury (in shares) | shares			9.1
Fair market value of shares received into treasury			$ 339.0
Convertible Debt | 0% Notes
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		0.00%	0.00%	0.00%		0.00%		0.00%
Threshold trading days | day		20
Threshold consecutive trading days | day		30
Threshold percentage of stock price trigger (greater than or equal to)		130.00%

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