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Long-term Debt (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Long-term Debt $ 1,623.3 $ 1,625.6
Less: current portion 2.0 2.1
Long-term Debt, Excluding Current Maturities $ 1,621.3 1,623.5
2.25% Notes    
Statement of Financial Position [Abstract]    
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 $ 0.3  
Long-term Debt, Book Value 299.7 299.6
Long-term Debt, Fair Value [1] $ 302.0 301.2
4.00% Notes    
Statement of Financial Position [Abstract]    
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 $ 2.0  
Long-term Debt, Book Value 248.0 247.7
Long-term Debt, Fair Value [1] $ 252.6 255.2
3.75% Notes    
Statement of Financial Position [Abstract]    
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  
Long-term Debt, Book Value 498.9 498.8
Long-term Debt, Fair Value [1] $ 493.1 499.8
4.20% Notes    
Statement of Financial Position [Abstract]    
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  
Long-term Debt, Book Value 499.2 499.1
Long-term Debt, Fair Value [1] 498.6 509.8
Other notes payable and capitalized leases    
Statement of Financial Position [Abstract]    
Long-term Debt, Book Value 77.5 80.4
Long-term Debt, Fair Value [1] $ 77.5 $ 80.4
[1] See Note 12 for information on the fair value measurement of our long-term debt.