Summary of Significant Accounting Policies (Adjustments in Consolidated Statement of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income including noncontrolling interest	$ 67.1	[1]	$ 69.1	[1]	$ 47.7	[1]
Deferred income taxes	8.9	[1]	21.1	[1]	(52.5)	[1]
Inventory impairment charges					0
Increase in inventories	(130.9)	[1]	(162.5)	[1]	244.7	[1]
Net cash flows of operating activities	97.3	[1]	98.9	[1]	546.3	[1]
As Originally Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income including noncontrolling interest					99.8
Deferred income taxes					(26.8)
Inventory impairment charges					(34.6)
Increase in inventories					201.5
Net cash flows of operating activities					546.3
Adjustments [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income including noncontrolling interest					(52.1)
Deferred income taxes					(25.7)
Inventory impairment charges					34.6
Increase in inventories					43.2
Net cash flows of operating activities					$ 0

[1] See Note 22 -Restatement of Consolidated Financial Statements