Owners' Equity - Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2014

Class of Stock [Line Items]

Preferred Unit Distributions [Table Text Block]

The Company paid the following Equity Preferred Unit distributions for the years ended December 31:

	2013	2012
Distributions (in millions)	$1.6	$9.9
Distribution per unit:
Series B	—	$0.45
Series E	$1.21	$3.50
Series F	$1.32	$1.43
Series G	$1.33	$3.35
Series H	—	$0.77

Liberty Property Limited Partnership [Member]

Class of Stock [Line Items]

Preferred Unit Distributions [Table Text Block]

The Operating Partnership paid the following Equity Preferred Unit distributions for the years ended December 31:

	2013	2012
Distributions (in millions)	$1.6	$9.9
Distribution per unit:
Series B	—	$0.45
Series E	$1.21	$3.50
Series F	$1.32	$1.43
Series G	$1.33	$3.35
Series H	—	$0.77