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Long-Term Debt (Details Of Long-Term Debt, Weighted Average Interest Rates And Due Dates) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total $ 1,251.7 $ 959.8
Less current maturities 153.8 3.6
Noncurrent portion of long-term debt 1,097.9 956.2
Term notes (1)    
Debt Instrument [Line Items]    
Total $ 1,239.1 $ 745.3
Year-end Interest Rate (3.70%) (3.80%)
Due Date Through 2027 2024
Industrial development bonds, principally variable interest rates    
Debt Instrument [Line Items]    
Total $ 6.2 $ 12.5
Year-end Interest Rate (1.30%) 0.00%
Due Date Through 2030 2030
Commercial paper (2)    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate   1.00%
Total $ 0.0 $ 195.9
Year-end Interest Rate
Due Date Through 2022 2021
Capitalized leases (primarily machinery, vehicle and office equipment)    
Debt Instrument [Line Items]    
Capital Lease Obligations $ 5.7 $ 5.7
Capitalized leases (primarily machinery, vehicle and office equipment)    
Debt Instrument [Line Items]    
Total $ 0.7 $ 0.4
Net Commercial Paper Activity [Member]    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 1.40% 0.80%