Income Taxes (Unrecognized Tax Benefit) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at January 1	$ 27.1	$ 45.1
Increases related to: tax positions taken during a prior period	3.6	1.2
Increases related to: tax positions taken during the current period	0.9	0
Decreases related to: tax positions taken during a prior period	0	(15.7)
Decreases related to: lapse of applicable statute of limitations	(1.9)	0
Decreases related to: settlements with taxing authorities	0	(3.5)
Unrecognized tax benefits at December 31	$ 29.7	$ 27.1

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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