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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, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total $ 1,169.0 $ 1,251.7
Unamortized discounts and deferred loan cost (10.1) (10.9)
Less: current maturities 1.2 153.8
Noncurrent portion of long-term debt 1,167.8 $ 1,097.9
Year ended December 31    
2019 1.2  
2020 1.1  
2021 1.1  
2022 370.1  
2023 0.0  
Thereafter $ 795.5  
Term notes    
Year ended December 31    
Redemption price, percent 100.00%  
Redemption price, if Change of Control Repurchase Event occurs, percent 101.00%  
Long-term debt, term 90 days  
Limitation on secured debt, percent 15.00%  
Industrial development bonds, principally variable interest rates    
Debt Instrument [Line Items]    
Year-end Interest Rate 1.90% 1.30%
Total $ 3.8 $ 6.2
Commercial paper    
Debt Instrument [Line Items]    
Year-end Interest Rate 2.60% 0.00%
Total $ 70.0 $ 0.0
Capitalized leases (primarily machinery, vehicles and office equipment)    
Debt Instrument [Line Items]    
Capitalized leases (primarily machinery, vehicles and office equipment) 4.7 5.7
Other, partially secured    
Debt Instrument [Line Items]    
Total $ 0.6 $ 0.7
Net commercial paper    
Year ended December 31    
Weighted average interest rate 2.40% 1.40%
Senior Notes, Due 2018 | Term notes    
Debt Instrument [Line Items]    
Year-end Interest Rate   4.40%
Total   $ 150.0
Senior Notes, Due 2022 | Term notes    
Debt Instrument [Line Items]    
Year-end Interest Rate 3.40% 3.40%
Total $ 300.0 $ 300.0
Senior Notes, Due 2024 | Term notes    
Debt Instrument [Line Items]    
Year-end Interest Rate 3.80% 3.80%
Total $ 300.0 $ 300.0
Senior Notes, Due 2027 | Term notes    
Debt Instrument [Line Items]    
Year-end Interest Rate 3.50% 3.50%
Total $ 500.0 $ 500.0