Cost Reduction Plan - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2015
Restructuring and Related Activities [Abstract]
Estimated restructuring and related costs over next four years	$ 235.1
Expected capital expenditures	60.5
Cost incurred to date, excluding capital expenditures	79.5
Capital expenditures incurred to date	32.5
Accelerated depreciation expense	$ 3.9
Non-cash accelerated depreciation expense due to CIP		$ 0.7	$ 0.8