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Financial Instruments (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 16, 2020
USD ($)
Nov. 28, 2017
USD ($)
Nov. 27, 2017
USD ($)
Nov. 07, 2017
USD ($)
May 06, 2016
USD ($)
Apr. 08, 2016
USD ($)
Debt Instrument [Line Items]              
Maximum leverage ratio allowed 3.50            
Minimum interest coverage ratio required 3.00            
Leverage ratio 1.69            
Interest coverage ratio 13.82            
Credit Agreement [Member]              
Debt Instrument [Line Items]              
Amount of credit facility         $ 685.0   $ 550.0
Amount of credit facility outstanding $ 491.0            
Additional amount that can be borrowed on facility $ 194.0            
LIBOR spread 1.375%            
Credit Agreement [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
LIBOR spread 1.75%            
Credit Agreement [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
LIBOR spread 1.25%            
Interest Rate Current Swap [Member] | Credit Agreement [Member]              
Debt Instrument [Line Items]              
Borrowings, revolving credit facility       $ 300.0   $ 120.0  
Notional amount   $ 350.0 $ 350.0        
Fixed interest rate in swap   71.00% 2.11%        
LIBOR rate   3.485%          
Amount paid to terminate agreement           $ 5.2  
Amount received from terminate agreement       $ 6.3