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Fair Value Measurements Fair value measurements - items not carried at fair value (Details) - USD ($)
$ in Millions
Jul. 02, 2016
Dec. 31, 2015
Nov. 08, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Senior Notes $ 5,918.6 $ 4,698.3 $ 2,300.0
Public Bonds and Private Placement [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Senior Notes 5,200.0 3,900.0  
Public Bonds and Private Placement [Member] | Fair value, inputs, level 1 [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt instrument, fair value disclosure 5,100.0 3,800.0  
Retail Bonds [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Instrument, Unamortized Premium 67.5 82.5  
Long-term Debt 818.6 798.3  
Retail Bonds [Member] | Fair value, inputs, level 2 [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt instrument, fair value disclosure $ 885.3 $ 859.8