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Derivative Financial Instruments and Hedging Activities (Tables)
12 Months Ended
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
The table below presents the effect of our derivative financial instruments in the consolidated statements of income and comprehensive income for the years ended December 31, 2020, 2019, and 2018:
 (in millions)Unrealized Gain (Loss)
Recognized in Other
Comprehensive  Income
(“OCI”) on Derivatives
Location of Gain (Loss)
Reclassified from
Accumulated OCI into Income
Amount of Gain (Loss)
Reclassified from
Accumulated OCI
into Income
Derivatives in Cash Flow Hedging Relationships202020192018202020192018
Interest Rate Swaps$— $(13.0)$6.8 Interest expense$(1.3)$0.1 0.4