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Debt And Derivative Instruments (Narrative) (Details)
$ in Millions
1 Months Ended
Jul. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
item
Debt Instrument [Line Items]      
Derivative, Number of instruments held | item     0
Amount expected to be reclassified in the next twelve months   $ 0.6  
Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Derivative, Maturity Date Jun. 30, 2025    
Derivative amount $ 500.0 $ 500.0  
Derivative, Fixed Interest Rate 0.29% 0.29%  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum credit commitment   $ 388.7  
Available borrowing capacity   248.8  
Revolving Credit Facility [Member] | Consortium of Banks [Member]      
Debt Instrument [Line Items]      
Letters of credit outstanding   $ 0.1