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Leases And Other Commitments - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Dec. 31, 2017
Operating Leased Assets [Line Items]          
Stockholders' equity $ 1,826.5 $ 882.6 $ 663.3   $ 419.4
Operating lease right-of-use assets 93.3 71.5   $ 26.7  
Finance lease right-of-use assets       15.3  
Operating lease liability 118.3     40.4  
Finance lease liability 62.8     $ 15.9  
Asset retirement obligations 4.5 2.6      
Rent expense     12.5    
Amortization of operating lease right-of-use asset 12.4 9.1      
Purchase obligations $ 335.6        
Term of purchase obligations 1 year        
Cumulative Effect, Period of Adoption, Adjustment          
Operating Leased Assets [Line Items]          
Stockholders' equity     2.1    
Minimum          
Operating Leased Assets [Line Items]          
Renewal term 3 years        
Remaining lease terms 1 year        
Maximum          
Operating Leased Assets [Line Items]          
Renewal term 5 years        
Remaining lease terms 20 years        
Retained Earnings          
Operating Leased Assets [Line Items]          
Stockholders' equity $ (202.1) $ (695.7) (798.9)   $ (671.8)
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment          
Operating Leased Assets [Line Items]          
Stockholders' equity     2.1    
Retained Earnings | Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment          
Operating Leased Assets [Line Items]          
Stockholders' equity     $ (2.1)