Commitments and Contingencies (Textual) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2015	Dec. 31, 2018 USD ($) Joint_Venture	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)
Operating Leased Assets [Line Items]
Lease income per diem arrangements recognized		$ 6.3	$ 5.6	$ 4.9
Management and service fees		9.3	5.9	5.7
Rental expense under agreements net		6.1	5.4	12.3
Future minimum lease payments, 2019		5.8
Future minimum lease payments, 2020		3.7
Future minimum lease payments, 2021		2.7
Future minimum lease payments, 2022		2.1
Future minimum lease payments, 2023		0.5
Future minimum lease payments, thereafter		$ 0.3
Number of ethanol joint ventures | Joint_Venture		2
Periods of lease income renewals		7 years 6 months
Operating lease income		$ 2.1	2.0	$ 2.0
Build-to-Suit Lease
Operating Leased Assets [Line Items]
Lease agreement initial term of contract	15 years
Build-to-Suit Lease | Other Long-term Liabilities
Operating Leased Assets [Line Items]
Built-to-suit financial obligation		22.7	24.3
Build-to-Suit Lease | Other Current Liabilities
Operating Leased Assets [Line Items]
Built-to-suit financial obligation		1.6	$ 1.4
Plant Nutrient | Legal Claim 2015
Operating Leased Assets [Line Items]
Loss contingency reserve						$ 2.2
Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Prepaid amount under long term purchase commitment		$ 6.7
Remaining obligation under long term purchase commitment					$ 70.3