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Debt - Junior Convertible Securities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]        
Debt $ 2,299,300,000 $ 2,299,300,000   $ 2,312,100,000
Repayments of long-term debt   22,800,000 $ 350,000,000.0  
Repurchase of junior convertible securities, equity impact 1,900,000 4,800,000    
Additional Paid-In Capital        
Debt Instrument [Line Items]        
Repurchase of junior convertible securities, equity impact 1,900,000 4,800,000    
Junior convertible securities        
Debt Instrument [Line Items]        
Debt $ 556,400,000 $ 556,400,000   $ 314,000,000.0
Junior Convertible Trust Preferred Securities | Junior convertible securities        
Debt Instrument [Line Items]        
Debt interest rate 5.15% 5.15%    
Debt $ 304,500,000 $ 304,500,000    
Face amount $ 409,800,000 $ 409,800,000    
Debt instrument, term   16 years    
Repayments of long-term debt   $ 22,800,000    
Repurchase of junior convertible securities, debt impact   15,400,000    
Deferred tax liabilities, net, decrease resulting from repurchase of junior convertible securities   4,900,000    
Junior Convertible Trust Preferred Securities | Junior convertible securities | Additional Paid-In Capital        
Debt Instrument [Line Items]        
Repurchase of junior convertible securities, equity impact   $ 4,800,000