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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Line Items]      
Federal statutory rate 21.00% 21.00% 21.00%
fair value of intellectual property $ 1,800.0   $ 1,200.0
Liability for Uncertain Tax Positions, Noncurrent 7.1    
Deferred Tax Asset Research and Development Costs 23.6 $ 12.0  
Deferred Tax Asset Intellectual property 266.2 147.0  
Deferred Tax Asset, Valuation Allowance, Change in Tax Systems 64.7    
Deferred tax asset related to Non-US intellectual property 118.0 $ 0.0 $ 165.5
State [Member]      
Income Taxes [Line Items]      
Net operating loss carryforwards $ 38.4    
Foreign [Member]      
Income Taxes [Line Items]      
Tax credit carryforward expiration 2028 and 2033    
Federal And State [Member]      
Income Taxes [Line Items]      
Operating Loss Carryforwards, Date 2024 through 2034