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Debt and Capital Lease Obligations - Narrative (Q3) (Details) - USD ($)
$ in Millions
Jan. 12, 2021
Jan. 17, 2020
Jul. 17, 2021
Debt Instrument [Line Items]      
Repayments of long-term debt   $ 28.3  
Subsequent Event      
Debt Instrument [Line Items]      
Repayments of long-term debt $ 44.7    
2020 Financing Agreement      
Debt Instrument [Line Items]      
Debt and line of credit maximum borrowing capacity   72.5  
Unamortized debt discount 1.2    
Loss on extinguishment of debt $ 1.6    
2020 Financing Agreement | Secured Debt      
Debt Instrument [Line Items]      
Debt face amount   45.0  
2020 Financing Agreement | Delayed Draw Term Loan      
Debt Instrument [Line Items]      
Debt maximum borrowing capacity     $ 20.0
2020 Financing Agreement | Line of Credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit maximum borrowing capacity   7.5  
Line of credit maximum borrowing capacity sub-limit increase   $ 4.0