Long-term Debt and Short-term Borrowings (Interest Rates) (Details) - Secured Debt - Senior Secured Credit Facility Due January 2022	12 Months Ended
	Dec. 31, 2017
4.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
4.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
≤ 4.00 to 1.00 and 3.50 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
≤ 4.00 to 1.00 and 3.50 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
≤ 3.50 to 1.00 and 3.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
≤ 3.50 to 1.00 and 3.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
≤ 3.00 to 1.00 and 2.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
≤ 3.00 to 1.00 and 2.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
≤ 2.00 to 1.00 | Applicable Rate on Euro/AUD/CDN Dollar Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
≤ 2.00 to 1.00 | Applicable Rate on Base Rate Loans
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%