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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues $ 387.1 $ 372.0 $ 771.4 $ 736.4
Costs and expenses:        
Cost of revenues 47.1 50.3 96.2 100.2
Research and development 23.8 22.2 48.6 46.4
Selling, General and Administrative Expense 50.0 50.8 101.5 99.8
Total costs and expenses 120.9 123.3 246.3 246.4
Operating income 266.2 248.7 525.1 490.0
Interest expense (18.8) (18.9) (37.6) (37.7)
Non-operating income (loss), net 11.5 12.7 25.4 24.0
Income (Loss) before Income Taxes, Total 258.9 242.5 512.9 476.3
Income tax expense (60.1) (56.8) (120.0) (111.9)
Net Income 198.8 185.7 392.9 364.4
Other comprehensive income (loss) 0.0 (0.7) (0.2) (0.7)
Comprehensive Income $ 198.8 $ 185.0 $ 392.7 $ 363.7
Income (Loss) from Continuing Operations, Per Basic Share $ 2.01 $ 1.79 $ 3.93 $ 3.49
Income (Loss) from Continuing Operations, Per Diluted Share $ 2.01 $ 1.79 $ 3.93 $ 3.49
Basic 98.9 103.9 99.9 104.4
Diluted 99.0 104.0 99.9 104.5
Basic income (loss) per share        
Net Income $ 2.01 $ 1.79 $ 3.93 $ 3.49
Diluted income (loss) per share        
Net Income $ 2.01 $ 1.79 $ 3.93 $ 3.49
Shares used to compute net income per share        
Basic 98.9 103.9 99.9 104.4
Diluted 99.0 104.0 99.9 104.5