Long-Term Debt - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Sep. 30, 2018 USD ($)
Mortgage Loans
Debt Instrument [Line Items]
Number of loans as per loan agreements | loan	60
Aggregate principal amount	$ 418,900,000.0		$ 418,900,000.0
Borrowings outstanding	349,000,000		349,000,000
Current maturities of long-term debt	59,800,000		59,800,000
Additional net borrowings			42,700,000
Principal payments			43,700,000
Fixed interest rate borrowings	81,300,000	$ 86,800,000	81,300,000
Fair value of fixed interest rate borrowings	$ 77,400,000	92,900,000	77,400,000
U.K. Notes
Debt Instrument [Line Items]
Number of loans as per loan agreements | loan	18
Borrowings outstanding	$ 77,600,000		77,600,000
Current maturities of long-term debt	$ 7,800,000		7,800,000
Additional net borrowings			12,100,000
Principal payments			10,600,000
Maturity date of notes	Sep. 01, 2034
Brazil Note
Debt Instrument [Line Items]
Borrowings outstanding	$ 2,400,000		2,400,000
Current maturities of long-term debt	300,000		300,000
Additional net borrowings			0
Principal payments			400,000
Brazilian Third Party Loan
Debt Instrument [Line Items]
Borrowings outstanding	5,400,000		5,400,000
Additional net borrowings			0
5.00% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 550,000,000	550,000,000	$ 550,000,000
Interest rate	5.00%		5.00%
Fair value of long-term debt	$ 549,100,000	567,900,000	$ 549,100,000
5.25% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000	300,000,000	$ 300,000,000
Interest rate	5.25%		5.25%
Fair value of long-term debt	$ 296,300,000	310,900,000	$ 296,300,000
U.K. Working Capital Loans
Debt Instrument [Line Items]
Borrowings outstanding	19,600,000		19,600,000
Current maturities of long-term debt	2,000,000		2,000,000
Revolving Credit Facility | Brazilian Short-Term Financing Arrangement
Debt Instrument [Line Items]
Short-term loan	1,100,000		1,100,000
Borrowings made under short-term debt agreement			2,400,000
Principal payments under short-term debt agreement			800,000
Revolving Credit Facility | U.K. Working Capital Loans
Debt Instrument [Line Items]
Short-term loan	$ 13,400,000	$ 13,400,000	13,400,000
Borrowings made under short-term debt agreement			30,300,000
Principal payments under short-term debt agreement			$ 43,200,000
Number of loans as per loan agreements | loan	2	2
Revolving Credit Facility | U.S. Short-Term Financing Arrangement
Debt Instrument [Line Items]
Short-term loan		$ 24,700,000