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Basis of Presentation and Summary of Significant Accounting Policies (Goodwill And Other Intangible Assets) (Narrative) (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
Accounting Policies [Abstract]
Goodwill balance	$ 165.8		$ 165.8		$ 165.8
Shurgard trade name, book value	18.8		18.8		18.8
Finite-lived intangible assets, net book value	74.4		74.4		20.1
Finite-lived intangible assets, accumulated amortization	59.4		59.4		$ 27.3
Finite-lived intangible assets, amortization expense	23.3	$ 3.0	49.0	$ 12.0
Estimated future amortization expense, remainder of 2021	18.7		18.7
Estimated future amortization expense, 2022	39.1		39.1
Estimated future amortization expense, thereafter	$ 16.6		16.6
Increase in finite-lived intangible assets			$ 103.3

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Finite-Lived Intangible Assets, Amortization Expense, Thereafter

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The increase (decrease) during the reporting period in intangible assets (for example patents and licenses).

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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