Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Mar. 30, 2019	Sep. 26, 2020	Sep. 28, 2019
Measured on a recurring basis \| Level 3
Contingent Consideration
Beginning balance	$ 12.1	$ 12.1	$ 15.3	$ 11.9	$ 15.3
Changes in value	0.7	1.1		0.9	(0.9)
Settlements and other adjustments	0.0	0.0		0.0	(1.2)
Ending balance	12.8	13.2		12.8	13.2
Royalty Pharma Contingent Milestone Payments
Royalty Pharma Contingent Milestone Payments
Payments received			(250.0)
Royalty Pharma Contingent Milestone Payments \| Measured on a recurring basis \| Level 3
Royalty Pharma Contingent Milestone Payments
Beginning balance	99.0	89.1	$ 323.2	95.3	323.2
Payments received	0.0	0.0		0.0	(250.0)
Change in fair value	22.2	2.6		25.9	18.5
Ending balance	$ 121.2	$ 91.7		$ 121.2	$ 91.7

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-Subparagraph (c)(1)
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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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