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Financial Instruments - Derivatives and Hedging (Notional Amount) (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
derivative_instrument
Dec. 31, 2018
USD ($)
derivative_instrument
Derivative [Line Items]    
Amount expected to be reclassified from accumulated other comprehensive loss in the next twelve months $ 5,800,000  
Interest Rate Swap | Designated as Hedging Instrument    
Derivative [Line Items]    
Number of Instruments | derivative_instrument 7 10
Notional Amount $ 800,000,000 $ 1,200,000,000
Effective Date January 2, 2019 | Interest Rate Swap | Designated as Hedging Instrument    
Derivative [Line Items]    
Number of Instruments | derivative_instrument 0 4
Notional Amount   $ 300,000,000
Fixed interest rate   2.61%