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Debt including Finance Lease Obligations - Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Line of Credit Facility    
Total debt including finance lease obligations $ 1,509.6 $ 1,479.9
Less: debt issuance costs 6.2 6.5
Total debt, including finance lease obligations, net of debt issuance costs 1,503.4 1,473.4
Less: debt maturing within one year 0.9 0.9
Long-term debt including finance lease obligations 1,502.5 1,472.5
Revolving Credit Facility and other lines of credit    
Line of Credit Facility    
Total debt including finance lease obligations 858.0 828.0
Letters of credit outstanding 2.3 2.3
Available under the facility $ 139.7 169.7
Senior Notes | 3.88% Senior Notes due 2028    
Line of Credit Facility    
Stated rate 3.88%  
Total debt including finance lease obligations $ 550.0 550.0
Finance lease obligations    
Line of Credit Facility    
Total debt including finance lease obligations $ 101.6 $ 101.9