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Derivative and Hedging Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | $ 0.0 |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (0.3) | $ (0.3) | $ (0.7) | $ (0.7) |
Senior Unsecured Notes [Member] | 3.74% Notes Due 2028 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notes payable, effective interest rate | 3.74% |  | 3.74% |  | 3.74%
Senior Unsecured Notes [Member] | 3.67% Notes Due 2029 [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Notes payable, effective interest rate | 3.67% |  | 3.67% |  | 3.67%

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