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Debt (Components of Long-Term Debt Including Associated Interest Rates and Related Fair Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Oct. 01, 2017
Debt Instrument [Line Items]    
Total $ 4,955.3 $ 3,955.3
Total, Estimated Fair Value 5,033.0 4,039.0
Aggregate debt issuance costs and unamortized premium (26.1) (17.5)
Hedging Liabilities, Noncurrent (12.8) (5.2)
Total, Carrying Value, net of aggregate unamortized discount 4,916.4 3,932.6
Two Point Zero Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 350.0 350.0
Stated Interest Rate 2.00%  
Effective Interest Rate 2.012%  
Two Point Two Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0 0.0
Stated Interest Rate 2.20%  
Effective Interest Rate 2.228%  
Two Point Four Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0 500.0
Stated Interest Rate 2.45%  
Effective Interest Rate 2.511%  
Two Point One Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0 500.0
Debt Instrument, Face Value from Reopening of Previous Issuance $ 250.0 250.0
Stated Interest Rate 2.10%  
Effective Interest Rate 2.293%  
Effective Interest Rate for Reopening of Previous Issuance 1.60%  
Two Point Seven Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0 500.0
Stated Interest Rate 2.70%  
Effective Interest Rate 2.819%  
Three Point Eight Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 750.0 750.0
Stated Interest Rate 3.85%  
Effective Interest Rate 2.859%  
PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 755.3 755.3
Stated Interest Rate 0.372%  
Effective Interest Rate 0.462%  
Four Point Three Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 350.0 350.0
Stated Interest Rate 4.30%  
Effective Interest Rate 4.348%  
Three Point Seven Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0 0.0
Stated Interest Rate 3.75%  
Effective Interest Rate 3.765%  
Fair Value, Inputs, Level 2 [Member] | Two Point Zero Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value $ 350.0 352.0
Fair Value, Inputs, Level 2 [Member] | Two Point Two Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 500.0 0.0
Fair Value, Inputs, Level 2 [Member] | Two Point Four Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 480.0 481.0
Fair Value, Inputs, Level 2 [Member] | Two Point One Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 497.0 501.0
Estimated Fair Value from Reopening of Previous Issuance 248.0 250.0
Fair Value, Inputs, Level 2 [Member] | Two Point Seven Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 504.0 508.0
Fair Value, Inputs, Level 2 [Member] | Three Point Eight Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 796.0 806.0
Fair Value, Inputs, Level 2 [Member] | PointThreeSevenTwoPercentageYenDenominatedSeniorNotes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 762.0 760.0
Fair Value, Inputs, Level 2 [Member] | Four Point Three Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value 387.0 381.0
Fair Value, Inputs, Level 2 [Member] | Three Point Seven Five Percentage Senior Notes [Member]    
Debt Instrument [Line Items]    
Estimated Fair Value $ 509.0 $ 0.0