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Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets    
Operating (Right-of-use) [1] $ 395.6 $ 147.7
Finance 137.3 2.6
Total leased assets $ 532.9 $ 150.3
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,233.6 at 2021 and $1,191.4 at 2020 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,233.6 at 2021 and $1,191.4 at 2020
Current    
Operating $ 17.0 $ 7.8
Finance 10.2 1.2
Noncurrent    
Operating [1] $ 382.3 $ 142.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Trade accounts payable and accrued liabilities  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current maturities of long-term debt Current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term debt, including capitalized lease obligations  
Finance $ 127.2 $ 0.9
Total lease liabilities 536.7 152.4
Accumulated depreciation $ 5.0 $ 2.8
[1] *Prior year amounts have been revised to conform with current period presentation