Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Change in unrecognized tax benefits
Beginning balance	$ 48.7	$ 52.5
Additions for tax positions related to the current year	2.3	2.0
Additions for tax positions of prior years	0.9	0
Reductions for tax positions of prior years	0	(1.1)
Settlements	0	(3.3)
Expiration of statute of limitations	(0.1)	(0.1)
Ending balance	$ 51.8	$ 50.0

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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 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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