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Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 3,261.5 $ 1,287.6
Long-term Debt, Current Maturities 0.1 2.0
Long-term Debt, Excluding Current Maturities 3,261.4 1,285.6
3.50% Notes Due 2020 (less unamortized discount and issuance costs of $0.9 and $2.9, respectively)    
Debt Instrument [Line Items]    
Par Value $ 500.0  
Maturity Date Oct. 01, 2020  
Interest Rate Stated Percentage 3.50%  
Debt Instrument, Interest Rate, Effective Percentage 3.89%  
Unamortized Discount $ 0.9  
Issuance Cost 2.9  
Long-term Debt, Gross 496.2 0.0
Long-term Debt, Fair Value [1] $ 500.1 0.0
3.75% Notes Due 2021 (less unamortized discount and issuance costs of $0.3 and $3.2, respectively)    
Debt Instrument [Line Items]    
Maturity Date Oct. 01, 2021  
Interest Rate Stated Percentage 3.75%  
Debt Instrument, Interest Rate, Effective Percentage 3.98%  
Unamortized Discount $ 0.3  
Issuance Cost 3.2  
Long-term Debt, Gross 496.5 0.0
Long-term Debt, Fair Value [1] 500.8 0.0
4.00% Notes Due 2022 (less unamortized discount and issuance costs of $1.1 and $0.9, respectively)    
Debt Instrument [Line Items]    
Par Value $ 250.0  
Maturity Date Mar. 15, 2022  
Interest Rate Stated Percentage 4.00%  
Debt Instrument, Interest Rate, Effective Percentage 4.13%  
Unamortized Discount $ 1.1  
Issuance Cost 0.9  
Long-term Debt, Gross 248.0 247.6
Long-term Debt, Fair Value [1] 249.9 259.0
3.75% Notes Due 2023 (less unamortized discount and issuance costs of $0.7 and $1.8, respectively)    
Debt Instrument [Line Items]    
Par Value $ 500.0  
Maturity Date Feb. 15, 2023  
Interest Rate Stated Percentage 3.75%  
Debt Instrument, Interest Rate, Effective Percentage 4.32%  
Unamortized Discount $ 0.7  
Issuance Cost 1.8  
Long-term Debt, Gross 497.5 497.1
Long-term Debt, Fair Value [1] 494.9 513.2
4.20% Notes Due 2024 (less unamortized discount and issuance costs of $0.6 and $2.3, respectively)    
Debt Instrument [Line Items]    
Par Value $ 500.0  
Maturity Date Apr. 15, 2024  
Interest Rate Stated Percentage 4.20%  
Debt Instrument, Interest Rate, Effective Percentage 4.24%  
Unamortized Discount $ 0.6  
Issuance Cost 2.3  
Long-term Debt, Gross 497.1 496.7
Long-term Debt, Fair Value [1] 501.6 524.2
4.65% Notes Due 2028 (less unamortized discount and issuance costs of $1.7 and $4.4, respectively)    
Debt Instrument [Line Items]    
Par Value $ 500.0  
Maturity Date Oct. 01, 2028  
Interest Rate Stated Percentage 4.65%  
Debt Instrument, Interest Rate, Effective Percentage 4.78%  
Unamortized Discount $ 1.7  
Issuance Cost 4.4  
Long-term Debt, Gross 493.9 0.0
Long-term Debt, Fair Value [1] 500.6 0.0
5.40% Notes Due 2048 (less unamortized discount and issuance costs of $2.8 and $5.6, respectively)    
Debt Instrument [Line Items]    
Par Value $ 500.0  
Maturity Date Oct. 01, 2048  
Interest Rate Stated Percentage 5.40%  
Debt Instrument, Interest Rate, Effective Percentage 5.48%  
Unamortized Discount $ 2.8  
Issuance Cost 5.6  
Long-term Debt, Gross 491.6 0.0
Long-term Debt, Fair Value [1] 497.3 0.0
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 40.7 46.2
Long-term Debt, Fair Value [1] $ 40.7 $ 46.2
[1] See Note 13 for information on the fair value measurement of our long-term debt.