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Debt - 2017 Financings (Details) $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2017 USD ($) community	Jul. 31, 2017 USD ($) community loan_portfolio	Dec. 31, 2017 USD ($) community	Dec. 31, 2016 USD ($)	Jun. 30, 2017 USD ($) community	Jun. 30, 2011 USD ($)
Debt Instrument [Line Items]
Payments of debt restructuring			$ 12.4	$ 9.2
Non-Recourse First Mortgages
Debt Instrument [Line Items]
Extinguishment of debt			$ 78.9
Number of communities securing mortgage notes | community			13
First Mortgage Financing
Debt Instrument [Line Items]
Interest rate		4.81%
Debt maturity period		10 years
Percentage bearing fixed interest	60.00%	70.00%
Percentage bearing variable interest	40.00%	30.00%
First Mortgage Financing | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate basis	2.415%	2.44%
First Mortgage Financing | Non-Recourse Supplemental Loan
Debt Instrument [Line Items]
Principal amount					$ 54.7
Number of communities securing debt | community					7
Interest rate					4.69%
First Mortgage Financing | Mortgage Debt Due April 2018
Debt Instrument [Line Items]
Extinguishment of debt		$ 188.1
First Mortgage Financing | Mortgage Debt Due January 2021
Debt Instrument [Line Items]
Extinguishment of debt		$ 13.6
First Mortgage Financing | Mortgage Debt Due August 2018
Debt Instrument [Line Items]
Extinguishment of debt	$ 389.9
First Mortgage Financing | Mortgage Debt Due May 2023
Debt Instrument [Line Items]
Extinguishment of debt	$ 228.9
Secured Debt | Non-Recourse First Mortgages
Debt Instrument [Line Items]
Number of communities securing debt | community	51	22
Number of debt instruments refinanced | loan_portfolio		2
Proceeds from debt refinancing	$ 975.0	$ 221.3
Convertible notes payable
Debt Instrument [Line Items]
Principal amount			$ 316.3
Convertible notes payable | Convertible Senior Notes Due June 2018
Debt Instrument [Line Items]
Principal amount						$ 316.3
Interest rate						2.75%
One Half Principal, Maturing in 2024 | First Mortgage Financing
Debt Instrument [Line Items]
Interest rate	4.43%
One Half Principal, Maturing in 2027 | First Mortgage Financing
Debt Instrument [Line Items]
Interest rate	4.47%

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The number of the company's communities securing the Long-term debt instrument.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Contractual interest rate for funds borrowed, under the debt agreement.

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-SubTopic 10
-Section S99
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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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