Long-Term Debt and Loan Agreements - Schedule of Long Term Debt (Parenthetical) (Details)	3 Months Ended
	Mar. 31, 2019
4.67% Senior Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	4.67%
Debt instrument maturity period	2021
5.25% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate	5.25%
Debt instrument maturity period	2024
5.30% Senior Unsecured Notes due 2024 [Member]
Debt Instrument [Line Items]
Interest rate	5.30%
Debt instrument maturity period	2024
5.45% Senior Unsecured Notes due 2026 [Member]
Debt Instrument [Line Items]
Interest rate	5.45%
Debt instrument maturity period	2026