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Fair Value Measurements Fair value measurements - items not carried at fair value (Details) - USD ($)
$ in Millions
Apr. 02, 2016
Dec. 31, 2015
Nov. 08, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Senior Notes $ 5,937.1 $ 4,698.3 $ 2,300.0
BCH [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Goodwill $ 1,955.2