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Derivative Instruments and Hedging Activities (Forward Interest Rate Swap Agreements) (Details) - Interest rate swap agreements - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 25, 2018
May 23, 2018
Mar. 31, 2018
Derivative [Line Items]        
Notional amount $ 1,200.0 $ 200.0 $ 1,000.0 $ 0.0
Fixed Rate Paid   2.723% 2.915%