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Subsequent Events (Narrative) (Details) - Interest rate swap agreements - USD ($)
$ in Millions
Jul. 31, 2018
Jun. 30, 2018
Jun. 25, 2018
May 23, 2018
Mar. 31, 2018
Subsequent Event [Line Items]          
Derivative, fixed interest rate     2.723% 2.915%  
Notional amount   $ 1,200.0 $ 200.0 $ 1,000.0 $ 0.0
LIBOR | Subsequent Event          
Subsequent Event [Line Items]          
Derivative, fixed interest rate 2.89%        
Notional amount $ 300.0