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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Apr. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]          
Equity method investments $ 69.6 $ 69.6     $ 69.1
Investments in marketable equity securities 39.7 39.7     4.4
Unrealized gain (loss) on marketable securities (3.7) 10.3      
Investments in non-marketable equity securities $ 34.5 34.5     $ 61.8
Write-down of non-marketable equity securities and note receivable   20.0 $ 20.2    
Unrealized gain   $ 14.9      
Reclassified from Non-marketable Security to Marketable Security          
Schedule of Investments [Line Items]          
Investments in marketable equity securities       $ 25.0