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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Interest Rate Cap      
Derivative [Line Items]      
Notional amount   $ 1,200.0  
Cap agreement effective 12/31/18-12/31/20      
Derivative [Line Items]      
Notional amount   1,400.0  
Premium payments on interest rate cap agreements   6.0  
Interest Rate Contract      
Derivative [Line Items]      
Unrealized gain (loss) on effective portion of interest rate cap agreements   (13.0)  
Unrealized gain (loss) on effective portion of interest rate cap agreements $ (1.0)   $ 3.0
Amount expected to be reclassified from AOCL to interest expense in next twelve months   7.0  
Derivative      
Derivative [Line Items]      
Interest income (expense) reclassified into earnings $ (1.0) $ (2.0) $ (3.0)