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Allowance and Other Reserves - Balances and Activity of Allowance and Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | $ 1.6 |  |
Balance at end of year | 3.9 | $ 1.6 |
Reserve for cash basis tenants |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.9 | 0.0 |
Additions | 10.6 | 0.0 |
Deductions or other | 1.2 | 0.9 |
Balance at end of year | 12.7 | 0.9 | $ 0.0
Allowance for doubtful accounts |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.6 | 2.0 | 1.4
Additions | 3.6 | (0.4) | 1.3
Deductions or other | (1.3) | (1.0) | (0.7)
Balance at end of year | 2.6 | 0.6 | 2.0
Allowance for doubtful accounts | Impact of adoption of new accounting standards |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | (0.3) |  |
Balance at end of year |  | (0.3) |
Reserve for contract credits |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 2.3 | 0.0 |
Additions | 0.0 | 2.3 |
Deductions or other | 0.0 | 0.0 |
Balance at end of year | 2.3 | 2.3 | 0.0
Allowance for credit losses - financing receivables |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.0 |  |
Additions | (0.4) |  |
Deductions or other | 0.0 |  |
Balance at end of year | 3.9 | 0.0 |
Allowance for credit losses - financing receivables | Impact of adoption of new accounting standards |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 1.6 |  |
Balance at end of year |  | 1.6 |
Allowance for credit losses - financing receivables | Impact of adoption of new accounting standards | (Distribution in Excess of Accumulated Earnings) Earnings Surplus |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 2.7 |  |
Balance at end of year |  | 2.7 |
Allowance for credit losses - contract assets |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.0 |  |
Additions | (0.9) |  |
Deductions or other | (0.1) |  |
Balance at end of year | 0.7 | 0.0 |
Allowance for credit losses - contract assets | Impact of adoption of new accounting standards |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.3 |  |
Balance at end of year |  | 0.3 |
Allowance for credit losses - contract assets | Impact of adoption of new accounting standards | (Distribution in Excess of Accumulated Earnings) Earnings Surplus |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 1.4 |  |
Balance at end of year |  | 1.4 |
Loans allowance |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 1.6 | 1.6 | 1.6
Additions | 0.0 | 0.0 | 0.0
Deductions or other | 0.0 | 0.0 | 0.0
Balance at end of year | 0.0 | 1.6 | 1.6
Loans allowance | Impact of adoption of new accounting standards |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | (1.6) |  |
Balance at end of year |  | (1.6) |
Other reserves |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance at beginning of year | 0.4 | 0.4 | 0.4
Additions | 0.0 | 0.0 | 0.0
Deductions or other | (0.4) | 0.0 | 0.0
Balance at end of year | $ 0.0 | $ 0.4 | $ 0.4

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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