Equity Investments - LNS (Details) - LNS € in Millions, $ in Millions	Dec. 04, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
Schedule of Equity Method Investments [Line Items]
Contract extension period	9 years
Upfront fees associated with the new concession	€ 800
Concession upfront fees, installment one			€ 50
Concession upfront fees, installment two			300
Concession upfront fees, installment three			450
Accounts receivable from equity method investment | $		$ 13.3
Prorated
Schedule of Equity Method Investments [Line Items]
Concession upfront fees, installment one			10
Concession upfront fees, installment two			60
Concession upfront fees, installment three			€ 90