Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Net increase in valuation allowance	$ 83.4
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	10
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	15
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	130.8
Minimum tax credit carryforwards	35.9
Deferred Tax Assets, Tax Credit Carryforwards, General Business	11.1
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	282.1	178.8
Capital loss carryforwards, expiration dates	2020 and 2031
Total gross unrecognized tax benefits	36.0	84.3	113.4	104.3
Unrecognized tax benefits that would impact effective tax rate	33
Accrued interest and penalties	12.9	20.1
Expense for interest and penalties	3.8	4.5	1.6
Foreign [Member]
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	1,841.7
Foreign tax loss carryforwards	1,972.5
Operating Loss Carryforwards, Expiration Dates	2012 and 2026
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 282.1
Foreign tax credit carryforwards, expiration dates	2018 and 2021