XML 78 R63.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 196.1 $ 197.0
Unamortized debt issuance expense 0.6 0.7
Current portion of long-term debt 0.1 0.0
Long-term debt, excluding current portion $ 196.0 197.0
Senior A Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 3.67%  
Senior B Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 3.82%  
Senior C Notes Due 2027 [Member]    
Debt Instrument [Line Items]    
Debt instrument, stated interest rate 4.02%  
Note Payable Due 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0.1 0.1
Revolving credit facility, due 2020 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Description of Variable Rate Basis LIBOR  
Line of credit, noncurrent $ 28.6 29.6
Debt instrument, stated interest rate 1.00%  
Senior Notes [Member] | Senior A Notes Due 2022 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 42.0 42.0
Debt instrument, stated interest rate 3.67%  
Senior Notes [Member] | Senior B Notes Due 2024 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 53.0 53.0
Debt instrument, stated interest rate 3.82%  
Senior Notes [Member] | Senior C Notes Due 2027 [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 73.0 $ 73.0
Debt instrument, stated interest rate 4.02%