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Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,282.8 $ 1,287.6
Long-term Debt, Current Maturities 0.1 2.0
Long-term Debt, Excluding Current Maturities $ 1,282.7 1,285.6
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 $ 1.2  
Debt Instrument, Unamortized Debt Issuance Costs 0.9  
Long-term Debt, Gross 247.9 247.6
Long-term Debt, Fair Value [1] $ 251.6 259.0
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 $ 0.7  
Debt Instrument, Unamortized Debt Issuance Costs 1.9  
Long-term Debt, Gross 497.4 497.1
Long-term Debt, Fair Value [1] $ 495.6 513.2
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 $ 0.6  
Debt Instrument, Unamortized Debt Issuance Costs 2.4  
Long-term Debt, Gross 497.0 496.7
Long-term Debt, Fair Value [1] 503.3 524.2
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 40.5 46.2
Long-term Debt, Fair Value [1] $ 40.5 $ 46.2
[1] See Note 13 for information on the fair value measurement of our long-term debt.