Asset Impairments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Pre-tax asset impairment charge	$ 0.0	$ 0.0	$ 0.1	$ 2.0	$ 0.1	$ 2.0
Net (gain) from asset sales	0.2	1.5	$ 1.6	$ 1.6	$ 1.2	$ 1.3
Wexpro [Member] | Wexpro Brady Field [Member]
Property, Plant and Equipment [Line Items]
Pre-tax asset impairment charge		$ 2.0
Net (gain) from asset sales	$ 1.4