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Senior Bank Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Senior Bank Debt	Senior Bank Debt The Company has a senior unsecured multicurrency revolving $1.45 billion credit facility and a senior unsecured $385.0 million term loan facility. The credit facilities mature on September 30, 2020. Subject to certain conditions, the Company may further increase the commitments under the revolver by up to $350.0 million and borrow up to an additional $65.0 million under the term loan. The Company pays interest on any outstanding obligations under the credit facilities at specified rates, based either on the LIBOR rate or the prime rate as in effect from time to time. As of December 31, 2016 and 2017, the Company had outstanding borrowings under the revolver of $485.0 million and $425.0 million, respectively, and the weighted-average interest rate on outstanding borrowings was 1.88% and 2.76%, respectively. As of December 31, 2016 and 2017, the Company had outstanding borrowings under the term loan of $385.0 million in each period, and the weighted-average interest rate on outstanding borrowings was 1.87% and 2.69%, respectively. The Company pays commitment fees on the unused portion of its revolver. For the years ended December 31, 2016 and 2017, these fees amounted to $1.0 million and $1.5 million, respectively. The credit facilities contain financial covenants with respect to leverage and interest coverage, as well as customary affirmative and negative covenants, including limitations on priority indebtedness, asset dispositions and fundamental corporate changes, and certain customary events of default.

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- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-URI http://asc.fasb.org/topic&trid=2208564

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