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Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Debt	10. Debt During the nine months ended September 30, 2017, we made principal payments of $29.8 million and $4.9 million on our five-year term loan due August 2021 and our seven-year term loan due October 2020, respectively. For the nine months ended September 30, 2017 and 2016, cash payments for interest were $67.2 million and $59.5 million, respectively. Included in interest expense, net, are amortization of treasury lock settlements and amortization of financing costs. For both the three months ended September 30, 2017 and 2016, amortization of treasury lock settlements was $1.4 million, and for both the nine months ended September 30, 2017 and 2016, amortization of treasury locks was $4.2 million. For both the three months ended September 30, 2017 and 2016, amortization of financing costs was $0.5 million and during the nine months ended September 30, 2017 and 2016, amortization of financing costs was $1.5 million and $1.4 million, respectively.  At September 30, 2017 we had $1,647.7 million of fixed-rate senior notes and $977.6 million of variable-rate term loans outstanding. At September 30, 2017 the fair value of our fixed-rate debt was estimated to be $1,739.2 million. The difference between the book value and fair value is due to the difference between the period-end market interest rate and the stated rate of our fixed-rate debt. We estimated the fair value of our fixed-rate debt using quoted market prices (Level 2 inputs) within the fair value hierarchy, which is further defined in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2016 Annual Report on Form 10-K. The fair value of our variable-rate term debt approximates the carrying amount as our cost of borrowing is variable and approximates current market rates. For more information on our long-term debt and interest rates on that debt, see Note 9, Debt, of the Notes to Consolidated Financial Statements in "Part II, Item 8. Financial Statements and Supplementary Data" of our 2016 Annual Report on Form 10-K.

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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.

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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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