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Debt and Financing Arrangements (Interest rate derivatives) (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Interest rate swap, effective 2019  
Debt Instrument [Line Items]  
Notional Amount $ 250.0
Fixed Rate 2.025%
Interest rate swap, effective 2020  
Debt Instrument [Line Items]  
Notional Amount $ 200.0
Fixed Rate 2.249%
Interest rate swap, effective 2021  
Debt Instrument [Line Items]  
Notional Amount $ 100.0
Fixed Rate 2.315%