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Credit Facilities	6 Months Ended
Credit Facilities	Jun. 30, 2016
Debt Disclosure [Abstract]
Credit Facilities	Credit Facilities In June 2016, the Company exercised one of its two optional one year extensions on the $1.2 billion multi-currency Syndicated Facility (the "Syndicated Facility") amended June 19, 2015, to extend the maturity date from June 2020 to June 2021. At June 30, 2016, approximately $275.0 million was outstanding under the Syndicated Facility and is included in "Current portion of debt" in the accompanying condensed consolidated balance sheets. In July 2016, the Company executed an agreement to purchase $50.0 million of 2.39% Series G Senior Unsecured Notes maturing in July 2021. The notes will be used to pay down existing debt under the Syndicated Facility.