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Derivative and Hedging Activities Derivatives (Tables)
 3 Months Ended
Mar. 31, 2021
Derivatives [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 which were settled in 2018 and 2019 in the condensed consolidated statements of income and comprehensive income for the three months ended March 31, 2021 and 2020:
 (in millions)Unrealized Gain (Loss)
Recognized in Other
Comprehensive Income (Loss)
(“OCI”) on Derivatives		Location of Loss
Reclassified from
Accumulated OCI into Income		Amount of Loss
Reclassified from
Accumulated OCI
into Income
Derivatives in Cash Flow Hedging Relationships2021202020212020
Interest Rate Swaps$— $— Interest expense$(0.3)$(0.3)