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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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Contingent consideration        
Contingent Consideration        
Beginning balance $ 18.1 $ 52.0 $ 22.0 $ 69.9
Net realized (gains) losses (1.8) (1.3) (1.4) (15.6)
Currency translation adjustments (0.1) 1.4 0.0 1.3
Settlements 0.0 (2.4) (4.4) (5.9)
Ending balance 16.2 49.7 16.2 49.7
Royalty Pharma Contingent Milestone Payments        
Royalty Pharma Contingent Milestone Payments        
Beginning balance 124.9 184.5 134.5 0.0
Additions 0.0 0.0 0.0 184.5
Foreign currency effect 0.0 0.5 0.0 0.5
Change in fair value 0.6 (39.2) (9.0) (39.2)
Ending balance $ 125.5 $ 145.8 $ 125.5 $ 145.8