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Real Estate (Real Estate Available and Held for Sale) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- 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 + Details
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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 + Details
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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. + Details
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