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Goodwill and Intangibles, net - Estimated Amortization Expense (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
2020 $ 8.6  
2021 8.3  
2022 8.2  
2023 8.0  
2024 7.5  
Thereafter 47.7  
Net 88.3 $ 96.1
Insurance Contracts Acquired in Business Combination    
Business Acquisition [Line Items]    
2020 20.8  
2021 19.6  
2022 18.4  
2023 17.1  
2024 15.9  
Thereafter 129.2  
Net $ 221.0