Debt and Credit Agreements	3 Months Ended
Debt and Credit Agreements	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements In March 2012, the Company entered into an Amended and Restated Five Year Credit Agreement (the "Credit Agreement") providing for $525 million of borrowing capacity through a syndicate of 14 banks. On March 27, 2015, the Company entered into Amendment No. 3 ("Amendment No. 3") to the Credit Agreement. Amendment No. 3 provides for (i) $500 million of borrowing capacity, which the Company may request be increased to $550 million pending lenders’ agreement, through a syndicate of 11 banks; (ii) extension of the current termination date for the Credit Agreement from March 2, 2017 to June 2, 2019 upon successful completion of refinancing the Company's 2.7% notes due October 15, 2015; (iii) replacement of the existing consolidated debt to consolidated EBITDA ratio with a net debt to consolidated EBITDA ratio not to exceed 3.75 to 1.0 through March 31, 2016 and 3.5 to 1.0 thereafter; and (iv) modification to certain defined terms. During the three months ended March 31, 2015, the Company expensed $0.6 million of previously deferred financing costs associated with the Credit Agreement for banks which did not participate in Amendment No. 3 to the Credit Agreement. At March 31, 2015 and December 31, 2014, the Company had $147.0 million and $98.5 million, respectively, of Credit Agreement borrowings outstanding. At March 31, 2015 and December 31, 2014, all such balances were classified as long-term borrowings in the Condensed Consolidated Balance Sheets. Classification of such balances is based on the Company's ability and intent to repay such amounts over the subsequent twelve months, as well as reflects the Company's ability and intent to borrow for a period longer than a year. To the extent the Company expects to repay any amounts within the subsequent twelve months, the amounts are classified as short-term borrowings. At March 31, 2015, the Company's 2.7% notes due October 15, 2015 are classified as long-term debt on the Condensed Consolidated Balance Sheet based on the Company's intent and ability to refinance this debt using the debt capital markets and ability to refinance this debt under borrowings under the Credit Agreement.

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.

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