Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements. Due to its foreign operations, the company is exposed to the effects of foreign currency exchange rate fluctuations on the U.S. dollar, principally related to intercompany account balances. The company uses derivative financial instruments to reduce its exposure to market risks from changes in foreign currency exchange rates on such balances. The company enters into foreign exchange forward contracts, generally having maturities of 3 months or less, which have not been designated as hedging instruments. At September 30, 2016 and 2015, the notional amount of these contracts was $432.5 million and $409.3 million, respectively. At September 30, 2016 and 2015, the fair value of such contracts was a net gain of $0.1 million and a net loss of $0.8 million, respectively, of which $0.9 million and $0.6 million, respectively, has been recognized in “Prepaid expenses and other current assets” and $0.8 million and $1.4 million, respectively, has been recognized in “Other accrued liabilities” in the company’s consolidated balance sheet. For the nine months ended September 30, 2016 and 2015, changes in the fair value of these instruments was a loss of $19.8 million and a gain of $13.7 million, respectively, which has been recognized in earnings in “Other income (expense), net” in the company’s consolidated statement of income. The fair value of these forward contracts is based on quoted prices for similar but not identical financial instruments; as such, the inputs are considered Level 2 inputs. Financial assets with carrying values approximating fair value include cash and cash equivalents and accounts receivable. Financial liabilities with carrying values approximating fair value include accounts payable and other accrued liabilities. The carrying amounts of these financial assets and liabilities approximate fair value due to their short maturities. The fair value of long-term debt is based on market prices (Level 2 inputs). At September 30, 2016 and December 31, 2015, the fair value of the company's Senior Notes due 2017 was $216.8 million and $213.2 million, respectively. At September 30, 2016, the fair value of the company's Convertible Senior Notes due 2021, which were issued in March and April of 2016, was $259.2 million.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.