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Debt (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 30, 2017
USD ($)
4.875% Senior Notes due 2025      
Components of debt      
Interest rate (as a percent) 4.875% 4.875%  
Other Disclosures      
Face value of debt issued     $ 300.0
4.875% Senior Notes due 2025 | Carrying value      
Components of debt      
Total debt $ 316.2 $ 319.1  
4.875% Senior Notes due 2025 | Fair value      
Components of debt      
Total debt 330.0 $ 301.4  
Credit Facility      
Other Disclosures      
Credit facility, maximum borrowing capacity $ 200.0    
Credit facility covenant terms, financing leverage ratio, maximum 3.00    
Borrowings under the Credit Facility $ 0.0    
Janus Capital Group Inc | 4.875% Senior Notes due 2025      
Components of debt      
Interest rate (as a percent) 4.875%    
Other Disclosures      
Unamortized premium, net $ 16.2