Income Taxes Details Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Tax Provision (Benefit) [Line Items]
Income tax expense (benefit)	$ 4.0	$ (184.7)	$ (48.5)	$ (181.0)
Remeasurement benefit related to foreign income tax accounts	(1.3)	(37.1)	(2.7)	(35.5)
ATO Assessment of Australian Tax Returns [Member]
Income Tax Provision (Benefit) [Line Items]
Decrease in unrecognized tax benefits	19.5		48.4
Reasonably possible decrease in net unrecognized tax benefits due to potential audit settlements	25.0		25.0
Australia Deferred Tax Assets [Member]
Income Tax Provision (Benefit) [Line Items]
Valuation allowance, deferred tax asset, change in amount	(75.7)		(124.7)
U.S. Capital Loss Carryforwards [Member]
Income Tax Provision (Benefit) [Line Items]
Valuation allowance, deferred tax asset, change in amount		$ (25.5)