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Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,611.9 $ 1,612.2
Long-term Debt, Current Maturities 2.0 1.9
Long-term Debt, Excluding Current Maturities $ 1,609.9 1,610.3
2.25% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Nov. 15, 2017  
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
Debt Instrument, Interest Rate, Effective Percentage 2.30%  
Debt Instrument, Unamortized Discount $ 0.2  
Debt Instrument, Unamortized Debt Issuance Costs 0.8  
Long-term Debt, Gross 299.0 298.8
Long-term Debt, Fair Value [1] $ 299.7 299.3
4.00% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2022  
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Debt Instrument, Interest Rate, Effective Percentage 4.13%  
Debt Instrument, Unamortized Discount $ 1.9  
Debt Instrument, Unamortized Debt Issuance Costs 1.5  
Long-term Debt, Gross 246.6 246.4
Long-term Debt, Fair Value [1] $ 257.5 250.9
3.75% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Feb. 15, 2023  
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
Debt Instrument, Interest Rate, Effective Percentage 4.32%  
Debt Instrument, Unamortized Discount $ 1.1  
Debt Instrument, Unamortized Debt Issuance Costs 2.8  
Long-term Debt, Gross 496.1 496.0
Long-term Debt, Fair Value [1] $ 497.1 484.8
4.20% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Apr. 15, 2024  
Debt Instrument, Interest Rate, Stated Percentage 4.20%  
Debt Instrument, Interest Rate, Effective Percentage 4.24%  
Debt Instrument, Unamortized Discount $ 0.8  
Debt Instrument, Unamortized Debt Issuance Costs 3.3  
Long-term Debt, Gross 495.9 495.8
Long-term Debt, Fair Value [1] 517.2 496.4
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 74.3 75.2
Long-term Debt, Fair Value [1] $ 74.3 $ 75.2
[1] See Note 11 for information on the fair value measurement of our long-term debt.