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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. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Contingent consideration        
Royalty Pharma Contingent Milestone Payments        
Foreign currency effect $ (0.3) $ 0.2 $ (0.3) $ 1.5
Contingent Consideration        
Beginning balance 16.2 49.7 22.0 69.9
Net realized (gains) losses 1.1 (2.9) (0.3) (18.5)
Settlements (0.6) (2.1) (5.0) (8.0)
Ending balance 16.4 44.9 16.4 44.9
Royalty Pharma Contingent Milestone Payments        
Royalty Pharma Contingent Milestone Payments        
Beginning balance 125.5 145.8 134.5 0.0
Additions 0.0 0.0 0.0 184.5
Foreign currency effect 0.0 0.3 0.0 0.8
Change in fair value 74.9 (2.9) 65.9 (42.1)
Ending balance $ 200.4 $ 143.2 $ 200.4 $ 143.2