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Investments (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jan. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 28, 2021
Dec. 31, 2020
Investments [Abstract]                  
Equity method investments       $ 90.8   $ 90.8   $ 27.4 $ 69.5
Payments to acquire equity method investments $ 23.8                
Equity method investment, ownership percentage 50.00%             50.00%  
Gain related to step-up fair value $ 12.3                
Investments in marketable equity securities       8.2   8.2     62.4
Sale of marketable securities   $ 51.0              
Realized loss   $ 5.4              
Unrealized gain (loss) on marketable securities       (0.8) $ (3.7) (3.2) $ 10.3    
Investments in non-marketable equity securities       $ 36.9   $ 36.9     $ 35.8
Write-down of non-marketable equity securities and note receivable             $ 20.0    
Unrealized gain     $ 14.9