Contingencies Enviromental liabilities rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Beginning Balance	$ 14.2
Adjusted to expense (income) during the year		$ 0.0	$ 0.0
Ending Balance	16.8	14.2
Reserve for Environmental Costs [Member]
Beginning Balance	13.6	14.9
Adjusted to expense (income) during the year	0.5	1.3	1.3
Ending Balance	16.6	13.6	14.9
Other operating charges and credits [Member]
Adjusted to expense (income) during the year	3.2	$ 0.5	$ 0.0
Formal cost share [Member]
Other Unrecorded Amounts	2.3
Indemnification Agreement [Member]
Other Unrecorded Amounts	2.8
Other Reserves [Member]
Other Unrecorded Amounts	$ 0.3