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Debt - 2017 Financings/Convertible Debt (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 31, 2017 USD ($) community | Jul. 31, 2017 USD ($) loan_portfolio community | Sep. 30, 2017 USD ($) community | Dec. 31, 2016 USD ($) | Jun. 30, 2011 USD ($)
Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate |  | 4.81% |  |  |
Term of debt instrument |  | 10 years |  |  |
Percentage of principal bearing fixed rate | 60.00% | 70.00% |  |  |
Percentage of principal bearing variable rate | 40.00% | 30.00% |  |  |
Mortgages [Member] | Non-Recourse Supplemental Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 54.7 |  |
Number of communities securing debt | community |  |  | 7 |  |
Fixed rate |  |  | 4.69% |  |
Mortgages [Member] | Mortgage Debt Due April 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt |  | $ 188.1 |  |  |
Mortgages [Member] | Mortgage Debt Due January 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt |  | $ 13.6 |  |  |
Mortgages [Member] | Mortgage Debt Due August 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt | $ 389.9 |  |  |  |
Mortgages [Member] | Mortgage Debt Due May 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt | $ 228.9 |  |  |  |
Secured Debt [Member] | Non-Recourse First Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of communities securing debt | community | 51 | 22 |  |  |
Number of loan portfolios refinanced | loan_portfolio |  | 2 |  |  |
Proceeds from debt refinancing | $ 975.0 | $ 221.3 |  |  |
Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 316.3 | $ 316.3 |
Convertible Debt [Member] | Convertible Senior Notes Due June 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 316.3
Fixed rate |  |  |  |  | 2.75%
Convertible debt |  |  | $ 306.1 |  |
One Half Principal, Maturing in 2024 [Member] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate | 4.43% |  |  |  |
One Half Principal, Maturing in 2027 [Member] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fixed rate | 4.47% |  |  |  |
LIBOR [Member] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate basis | 2.415% | 2.44% |  |  |

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- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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