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Investments - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Jul. 19, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items]        
Equity securities   $ 792.5   $ 721.5
Change in fair value of investments   71.0 $ (212.7)  
PTC        
Subsidiary, Sale of Stock [Line Items]        
Number of shares purchased (in shares) 10,582,010      
Purchase of stock price (usd per share) $ 94.50      
Consideration paid to purchase stock $ 1,000.0      
Purchase of stock purchase period 3 years      
Sale of stock, subsequent trading period 90 days      
Equity securities   792.5    
Change in fair value of investments   $ 71.0 $ (212.7)  
PTC | Minimum        
Subsidiary, Sale of Stock [Line Items]        
Percentage of total outstanding common stock, that can be traded in future periods 1.00%      
PTC | Maximum        
Subsidiary, Sale of Stock [Line Items]        
Percentage of total outstanding common stock, that can be traded in future periods 2.00%