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Long-term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt, gross $ 257.4 $ 258.0
Unamortized debt issuance costs 0.7 0.7
Long-term debt 256.7 257.3
Current portion of long-term debt 2.3 2.3
Long-term debt, excluding current portion $ 254.4 $ 255.0
Term Loan Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 2.78% 2.78%
Long-term debt, gross $ 89.4 $ 90.0
Current portion of long-term debt 2.3  
Long-term debt, excluding current portion $ 87.1  
Series A Notes, Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 3.67% 3.67%
Long-term debt, gross $ 42.0 $ 42.0
Series B Notes, Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 3.82% 3.82%
Long-term debt, gross $ 53.0 $ 53.0
Series C Notes, Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.02% 4.02%
Long-term debt, gross $ 73.0 $ 73.0