Investments - Summary of Real Estate and Loan Activity, Net of Accumulated Depreciation and Amortization (Footnote) (Details) $ in Millions |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
USD ($)
Property
|
Dec. 31, 2014
Property
|
|
| Real Estate Properties [Line Items] | ||
| Revenue producing capitalized expenditures | $ 0.2 | |
| Capitalized maintenance expenditures | 0.2 | |
| Accumulated depreciation and amortization associated with dispositions of real estate | $ 12.5 | |
| Number of properties sold under 1031 Exchanges | Property | 6 | |
| Amount of properties sold under 1031 Exchanges | $ 39.4 | |
| Amount of properties acquired under 1031 Exchanges | $ (32.5) | |
| Number of properties acquired under 1031 Exchanges | Property | 4 | |
| Properties Vacant | ||
| Real Estate Properties [Line Items] | ||
| Number of properties | Property | 42 | 37 |
| Property Held For Sale | ||
| Real Estate Properties [Line Items] | ||
| Number of properties | Property | 14 | 8 |