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Derivative Instruments and Hedging Activities (Forward Interest Rate Swap Agreements) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 24, 2018
Jul. 31, 2018
Jun. 25, 2018
May 23, 2018
Mar. 31, 2018
Interest rate swap agreements            
Derivative [Line Items]            
Notional amount $ 1,700.0   $ 300.0 $ 200.0 $ 1,000.0 $ 0.0
Fixed Rate Paid     2.885% 2.723% 2.915%  
Interest rate swap agreements - fixed rate paid 2.744%            
Derivative [Line Items]            
Notional amount   $ 50.0        
Fixed Rate Paid   2.744%        
Interest rate swap agreements - fixed rate paid 2.808%            
Derivative [Line Items]            
Notional amount   $ 100.0        
Fixed Rate Paid   2.808%        
Interest rate swap agreements - fixed rate paid 2.728%            
Derivative [Line Items]            
Notional amount   $ 50.0        
Fixed Rate Paid   2.728%