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Hedging Activities and Fair Value Measurements - Comprehensive Income (Loss) (Details) - Interest Rate Swaps - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Gains and Losses on Derivatives Designated as Cash Flow Hedges [Abstract]        
Loss recognized in AOCI on derivatives $ (0.1) $ (0.4) $ (4.4) $ (7.4)
Loss reclassified from AOCI into income (effective portion) $ (5.3) $ (4.7) $ (18.5) $ (12.3)