Summary of Significant Accounting Policies, Narrative, Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment
Interest expense capitalized as construction in progress	$ 0.6	$ 0.4	$ 2.4	$ 1.1
Depreciation expense			$ 25.5	$ 23.0