Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance	$ 6.3	$ 5.0
Additions for tax positions taken in the current year	0.7	1.3
Additions for tax positions of prior years	0	0.7
Reduction for expiration of statute of limitations/audits	(0.2)	(0.7)
Balance	$ 6.8	$ 6.3