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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jan. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Feb. 28, 2021
Dec. 31, 2020
Investments [Abstract]                
Equity method investments $ 90.7   $ 90.7   $ 90.7   $ 27.4 $ 69.5
Payments to acquire equity method investments $ 23.8              
Equity method investment, ownership percentage 50.00%   50.00%   50.00%   50.00%  
Gain related to step-up fair value         $ 12.3      
Investments in marketable equity securities $ 9.0   $ 9.0   9.0     62.4
Sale of marketable securities   $ 51.0            
Realized loss   $ 5.4            
Unrealized gain (loss) on marketable securities     (2.4) $ (15.0) (2.4) $ (14.0)    
Investments in non-marketable equity securities $ 36.9   $ 36.9   $ 36.9     $ 35.8
Write-down of non-marketable equity securities and note receivable           $ 20.0