Long-Term Debt And Short-Term Borrowings (Notes Payable and Long-term Debt) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 958,000,000	$ 939,500,000
Current portion	42,800,000	43,200,000
Debt issuance costs, unamortized	6,800,000	7,100,000
Long-term debt, net	908,400,000	889,200,000
Other borrowings
Debt Instrument [Line Items]
Total debt	1,200,000	600,000
Senior Secured Notes | Euro Senior Secured Term Loan A, due January 2022 (floating interest rate of 1.50% at March 31, 2018 and 1.50% at December 31, 2017)
Debt Instrument [Line Items]
Total debt	$ 350,600,000	$ 345,000,000
Line of Credit Facility, Interest Rate at Period End	1.50%	1.50%
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due January 2022 (floating interest rate of 3.44% at March 31, 2018 and 3.29% at December 31, 2017)
Debt Instrument [Line Items]
Total debt	$ 58,300,000	$ 60,000,000
Line of Credit Facility, Interest Rate at Period End	3.44%	3.29%
Senior Secured Notes | U.S. Dollar Senior Secured Revolving Credit Facility, due January 2022 (floating interest rate of 3.57% at March 31, 2018 and 3.53% at December 31, 2017)
Debt Instrument [Line Items]
Total debt	$ 56,500,000	$ 48,900,000
Line of Credit Facility, Interest Rate at Period End	3.57%	3.53%
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due January 2022 (floating interest rate of 3.40% at March 31, 2018 and 3.28% at December 31, 2017)
Debt Instrument [Line Items]
Total debt	$ 91,400,000	$ 85,000,000
Line of Credit Facility, Interest Rate at Period End	3.40%	3.28%
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)
Debt Instrument [Line Items]
Total debt	$ 400,000,000	$ 400,000,000
Stated Percentage	5.25%	5.25%
Senior Secured Credit Facility Due January 2022
Debt Instrument [Line Items]
Debt Instrument, Term	5 years
2017 Revolving Facility | Senior Secured Notes
Debt Instrument [Line Items]
Total debt	$ 147,900,000