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Debt - Composition of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other long-term debt $ 42.8 $ 33.6
Finance leases 83.0  
Finance leases   48.6
Total Debt 1,501.7 1,384.8
Less: unamortized discount on 5.00% notes & 5.25% notes (5.6) (7.4)
Less: unamortized debt issuance costs (4.8) (2.9)
Less current maturities of long-term debt (59.1) (93.0)
Long-term debt and capital lease obligations 1,432.1 1,281.5
Acquisition Line    
Debt Instrument [Line Items]    
Outstanding borrowing balance $ 72.5 31.8
5.00% Senior Note    
Debt Instrument [Line Items]    
Interest rate 5.00%  
5.25% Senior Note    
Debt Instrument [Line Items]    
Interest rate 5.25%  
5.00% Senior Note    
Debt Instrument [Line Items]    
Long-term debt $ 550.0 550.0
5.25% Senior Note    
Debt Instrument [Line Items]    
Long-term debt 300.0 300.0
Real estate related    
Debt Instrument [Line Items]    
Other long-term debt $ 453.3 $ 420.8