Derivative Instruments and Hedging Activities Open Interest Rate Swap Contracts (Details) - Cash Flow Hedging - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Interest rate swap
Derivative [Line Items]
Notional Amounts	$ 550.0	$ 550.0
Net Unrealized Gain (Loss)	5.4	(7.8)
Interest Rate Swap, September 2019 to September 2023
Derivative [Line Items]
Notional Amounts	150.0	150.0
Net Unrealized Gain (Loss)	0.3	(5.8)
Interest Rate Swap, March 2020 to February 2023
Derivative [Line Items]
Notional Amounts	400.0	400.0
Net Unrealized Gain (Loss)	$ 5.1	$ (2.0)