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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Accumulated depreciation $ 7,776.0 $ 7,292.0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 1,000,000,000 1,000,000,000
Common stock, issued 389,972,510 389,646,939
Common stock, outstanding 379,090,013 378,764,442
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 15,000,000 15,000,000
Preferred stock, issued 0 0
Preferred stock, outstanding 0 0