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Derivative and Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 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)	$ (1.0)	$ (1.0)
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%

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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+ References

No definition available.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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