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Financial Instruments and Risk Management (Financial Assets and Liabilities Carried at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities $ 46.7 $ 42.6  
Fair value of financial instruments 94.6 134.7  
Available-for-sale fixed income investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 35.5 35.3  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 222.9 688.8  
Equity securities 46.7 42.6  
Total assets at recurring fair value measurement 269.6 731.4  
Level 1 | Money market funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 222.9 688.8  
Level 1 | Exchange traded funds      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 46.5 42.4  
Level 1 | Marketable securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity securities 0.2 0.2  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets at recurring fair value measurement 130.1 170.0  
Financial and Nonfinancial Liabilities, Fair Value Disclosure 98.7 187.0  
Level 2 | Foreign currency forward contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign exchange derivative assets 94.6 134.7  
Foreign exchange derivative liabilities 98.7 187.0  
Level 2 | Available-for-sale fixed income investments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 35.5 35.3  
Level 2 | Corporate Bond Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 15.5 13.2  
Level 2 | U.S. Treasuries      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 9.7 11.7  
Level 2 | Agency mortgage-backed securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 4.8 4.7  
Level 2 | Asset-backed Securities      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 5.4 5.1  
Level 2 | Other      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale fixed income securities 0.1 0.6  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total assets at recurring fair value measurement   997.4 $ 1,028.9
Financial and Nonfinancial Liabilities, Fair Value Disclosure 379.1 375.0  
Level 3 | Contingent consideration      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other Liabilities, Fair Value Disclosure 379.1    
Level 3 | Convertible Preferred Stock      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity Securities, FV-NI 1,028.9 997.4  
Designated as Hedging Instrument      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value of financial instruments $ 44.8 $ 30.4