Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details) - Measured on a recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Contingent consideration	$ 13.2		$ 13.2		$ 15.3
Contingent Consideration
Beginning balance	12.1	$ 16.2	15.3	$ 22.0
Changes in value	1.1	1.1	(0.9)	(0.3)
Currency translation adjustments	0.0	(0.3)	0.0	(0.3)
Settlements and other adjustments	0.0	(0.6)	(1.2)	(5.0)
Ending balance	13.2	16.4	13.2	16.4
Royalty Pharma Contingent Milestone Payments
Royalty Pharma Contingent Milestone Payments
Beginning balance	89.1	125.5	323.2	134.5
Payments received	0.0	0.0	(250.0)	0.0
Change in fair value	2.6	74.9	18.5	65.9
Ending balance	$ 91.7	$ 200.4	$ 91.7	$ 200.4

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Foreign Currency Effect

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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

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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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