Contingencies Enviromental liabilities rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning Balance		$ 21.2
Adjusted to expense (income) during the year	10.7	5.0	11.5	2.5
Ending Balance		14.8	21.2
Reserve for Environmental Costs [Member]
Beginning Balance		15.0	14.3	14.7
Adjusted to expense (income) during the year		0.7	1.5	0.3
Payments made		(1.6)	(0.8)	(0.7)
Ending Balance		14.1	15.0	14.3
Formal cost share [Member]
Other Unrecorded Amounts		2.2
Indemnification Agreement [Member]
Other Unrecorded Amounts		2.7
Other Reserves [Member]
Other Unrecorded Amounts		$ 0.2