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Debt - Junior Convertible Securities (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
d
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]      
Debt $ 2,535.9   $ 2,535.3
Junior convertible securities      
Debt Instrument [Line Items]      
Debt 338.7   338.6
Junior Convertible Trust Preferred Securities | Junior convertible securities      
Debt Instrument [Line Items]      
Debt $ 341.7    
Debt interest rate 5.15%    
Unamortized debt issuance costs $ 3.0   $ 3.1
Conversion ratio per share of common stock 0.2558    
Face amount of convertible security (in usd per share) | $ / shares $ 50.00    
Adjusted conversion price (in dollars per share) | $ / shares $ 195.47    
Convertible debt, threshold trading days | d 20    
Convertible debt, threshold consecutive trading days | d 30    
Debt instrument, convertible, threshold percentage 1.30    
Repayments of convertible debt   $ 16.5  
Deferred tax liabilities, net, decrease resulting from repurchase of junior convertible securities   $ 2.7