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Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jul. 01, 2021
May 31, 2020
Financial assets:        
Equity securities $ 5.3 $ 10.7    
Senior Notes | 5.625% Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate 5.625% 5.625%    
Senior Notes | $4.125% Notes due 2029        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate 4.125% 4.125% 4.125%  
Convertible Notes        
Financial liabilities:        
Long-term debt $ 24.2 $ 24.2    
Convertible Notes | Convertible Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest rate 2.75%     2.75%
Recurring | Level 1        
Financial assets:        
Cash and cash equivalents $ 877.6 1,071.8    
Equity securities 5.3 10.7    
Available-for-sale debt securities 0.0 0.0    
Held-to-maturity securities 0.0 0.0    
Promissory notes 0.0 0.0    
Financial liabilities:        
Other liabilities 0.0 0.0    
Recurring | Level 1 | Amended Credit Facilities        
Financial liabilities:        
Long-term debt 0.0 1,483.5    
Recurring | Level 1 | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 0.0 388.0    
Recurring | Level 1 | Senior Notes | $4.125% Notes due 2029        
Financial liabilities:        
Long-term debt 0.0 340.0    
Recurring | Level 1 | Convertible Notes | Convertible Notes        
Financial liabilities:        
Long-term debt 0.0 427.6    
Recurring | Level 1 | Other long-term obligations        
Financial liabilities:        
Long-term debt 0.0 0.0    
Recurring | Level 2        
Financial assets:        
Cash and cash equivalents 0.0 0.0    
Equity securities 0.0 0.0    
Available-for-sale debt securities 0.0 0.0    
Held-to-maturity securities 6.7 6.7    
Promissory notes 7.9 7.9    
Financial liabilities:        
Other liabilities 2.7 2.7    
Recurring | Level 2 | Amended Credit Facilities        
Financial liabilities:        
Long-term debt 1,468.8 0.0    
Recurring | Level 2 | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 387.0 0.0    
Recurring | Level 2 | Senior Notes | $4.125% Notes due 2029        
Financial liabilities:        
Long-term debt 344.0 0.0    
Recurring | Level 2 | Convertible Notes | Convertible Notes        
Financial liabilities:        
Long-term debt 362.7 0.0    
Recurring | Level 2 | Other long-term obligations        
Financial liabilities:        
Long-term debt 8.1 18.0    
Recurring | Level 3        
Financial assets:        
Cash and cash equivalents 0.0 0.0    
Equity securities 0.0 0.0    
Available-for-sale debt securities 24.2 24.2    
Held-to-maturity securities 0.0 0.0    
Promissory notes 0.0 0.0    
Financial liabilities:        
Other liabilities 45.6 76.2    
Recurring | Level 3 | Amended Credit Facilities        
Financial liabilities:        
Long-term debt 0.0 0.0    
Recurring | Level 3 | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 0.0 0.0    
Recurring | Level 3 | Senior Notes | $4.125% Notes due 2029        
Financial liabilities:        
Long-term debt 0.0 0.0    
Recurring | Level 3 | Convertible Notes | Convertible Notes        
Financial liabilities:        
Long-term debt 0.0 0.0    
Recurring | Level 3 | Other long-term obligations        
Financial liabilities:        
Long-term debt 176.1 154.1    
Recurring | Carrying Amount        
Financial assets:        
Cash and cash equivalents 877.6 1,071.8    
Equity securities 5.3 10.7    
Available-for-sale debt securities 24.2 24.2    
Held-to-maturity securities 6.7 6.7    
Promissory notes 7.9 7.9    
Financial liabilities:        
Other liabilities 48.4 79.0    
Recurring | Carrying Amount | Amended Credit Facilities        
Financial liabilities:        
Long-term debt 1,453.2 1,471.7    
Recurring | Carrying Amount | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 399.8 399.7    
Recurring | Carrying Amount | Senior Notes | $4.125% Notes due 2029        
Financial liabilities:        
Long-term debt 395.0 394.6    
Recurring | Carrying Amount | Convertible Notes | Convertible Notes        
Financial liabilities:        
Long-term debt 327.0 326.1    
Recurring | Carrying Amount | Other long-term obligations        
Financial liabilities:        
Long-term debt 185.4 173.5    
Recurring | Fair Value        
Financial assets:        
Cash and cash equivalents 877.6 1,071.8    
Equity securities 5.3 10.7    
Available-for-sale debt securities 24.2 24.2    
Held-to-maturity securities 6.7 6.7    
Promissory notes 7.9 7.9    
Financial liabilities:        
Other liabilities 48.3 78.9    
Recurring | Fair Value | Amended Credit Facilities        
Financial liabilities:        
Long-term debt 1,468.8 1,483.5    
Recurring | Fair Value | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 387.0 388.0    
Recurring | Fair Value | Senior Notes | $4.125% Notes due 2029        
Financial liabilities:        
Long-term debt 344.0 340.0    
Recurring | Fair Value | Convertible Notes | Convertible Notes        
Financial liabilities:        
Long-term debt 362.7 427.6    
Recurring | Fair Value | Other long-term obligations        
Financial liabilities:        
Long-term debt $ 184.2 $ 172.1