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Real Estate (Real Estate Available and Held for Sale) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate Properties [Line Items]
Real estate asset held for sale	$ 96.8		$ 14.5
Proceeds from sale of real estate held for sale	165.2	$ 48.3	555.5
Net Lease
Real Estate Properties [Line Items]
Proceeds from sale of real estate held for sale	37.9	42.4	469.4
Operating Properties
Real Estate Properties [Line Items]
Real estate asset held for sale	96.8		14.5
Proceeds from sale of real estate held for sale	$ 127.3	$ 5.9	$ 86.1

X

- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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