Stockholders Equity (Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Estimated tax rate	40.00%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	$ 9.2
Unrealized gains (losses), arising during the period	30.6
Amounts reclassified out of AOCI during the period	(7.1)	[1]
Taxes on unrealized losses, arising during the period	(12.3)
Noncontrolling interest	(18.8)
Balance at June 30, 2014	1.6
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	4.3
Unrealized gains (losses), arising during the period	35.8
Amounts reclassified out of AOCI during the period	(0.3)
Taxes on unrealized losses, arising during the period	(13.9)
Noncontrolling interest	(18.8)
Balance at June 30, 2014	7.1
Forward Contract Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2013	4.9
Unrealized gains (losses), arising during the period	(5.2)
Amounts reclassified out of AOCI during the period	(6.8)
Taxes on unrealized losses, arising during the period	1.6
Noncontrolling interest	0
Balance at June 30, 2014	$ (5.5)

[1] Amounts reclassified out of accumulated other comprehensive income relate to the consolidation of investments previously accounted for under the equity method. Pursuant to FASB ASC 805-10, Business Combinations, these amounts are included in the calculation of gain or loss as of the acquisition date. Please refer to Note 4 - Real Estate for further discussion on consolidated acquisitions.