Income Taxes (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011
Summary of net operating loss and capital loss carryforwards, the expiration dates and the deferred tax assets thereon
2013-2017		$ 2.4
2018-2022		18.7
2023-2032		305.7
No expiration date		1,751.0
Total		2,077.8
Net deferred tax assets
Gross deferred tax asset		606.7
Valuation allowance		(227.6)
Net deferred tax asset		379.1
Foreign tax credit carryforwards, subject to expiration		8.8
Low-income housing tax credit		2.0
Alternative minimum tax credit carryforwards, not subject to expiration		2.7
United States
Summary of net operating loss and capital loss carryforwards, the expiration dates and the deferred tax assets thereon
2013-2017		2.4
2018-2022		18.7
2023-2032		305.7
Total		326.8
Net deferred tax assets
Gross deferred tax asset		102.7
Valuation allowance		(1.8)
Net deferred tax asset		100.9
Net operating loss carryforwards, subject to an annual limitation		29.1
Luxembourg
Summary of net operating loss and capital loss carryforwards, the expiration dates and the deferred tax assets thereon
No expiration date		1,740.3
Total		1,740.3
Net deferred tax assets
Gross deferred tax asset		501.2
Valuation allowance		(225.5)
Net deferred tax asset		275.7
Net operating loss carryforwards expected to be utilized		999.7
Deferred tax benefit due to increase in its NOLs	11.9
Sweden
Summary of net operating loss and capital loss carryforwards, the expiration dates and the deferred tax assets thereon
No expiration date		10.7
Total		10.7
Net deferred tax assets
Gross deferred tax asset		2.8
Valuation allowance		(0.3)
Net deferred tax asset		$ 2.5