Derivatives	9 Months Ended
Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	15. Derivatives All derivatives are recorded as other current or noncurrent assets or other current or noncurrent liabilities in the Condensed Consolidated Balance Sheets at their respective fair values. Unrealized gains and losses related to derivatives are recorded in the Condensed Consolidated Statements of Operations, or in other comprehensive income (loss), net of applicable income taxes, depending on the purpose for which the derivative is held. At the inception of a hedge transaction, we formally document the hedge relationship and the risk management objective for undertaking the hedge. In addition, we assess both at inception of the hedge and on an ongoing basis, whether the derivative in the hedging transaction has been highly effective in offsetting changes in fair value or cash flows of the hedged item and whether the derivative is expected to continue to be highly effective. The impact of any ineffectiveness is also recognized in the Condensed Consolidated Statements of Operations. We are exposed to the impact of foreign currency fluctuations based on our global operations. The exposure to foreign currency movements within many countries is limited because the operating revenues and expenses of our various subsidiaries and business units are substantially in the local currency of the country in which they operate. To the extent borrowings, sales, purchases, revenues, expenses or other transactions are not in the local currency of the subsidiary or operating unit, we are exposed to currency risk. Periodically, we use foreign exchange spot and forward contracts to hedge exposures resulting from foreign exchange fluctuations. To the extent the gains and losses associated with the fair values of foreign currency exchange contracts are recognized in the Condensed Consolidated Statements of Operations, they are generally offset by gains and losses on underlying payables, receivables and net investments in foreign subsidiaries. We do not use derivative financial instruments for trading or speculative purposes. The aggregate notional value of the forward contracts at September 30, 2019 and December 31, 2018 was $144.4 million and $170.8 million, respectively. The fair values of foreign currency contracts were determined to be Level 2 under the fair value hierarchy and are valued using market exchange rates. The total fair value of our foreign currency contracts, which were the only derivatives not designated as hedges, included in Prepaid expenses and other current assets at September 30, 2019 and December 31, 2018, was $0.2 million and $0.9 million, respectively. In addition, there was $3.0 million and $0.3 million of these derivatives included in Accrued liabilities and other at September 30, 2019 and December 31, 2018, respectively.

Derivatives

9 Months Ended

Sep. 30, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

15. Derivatives

All derivatives are recorded as other current or noncurrent assets or other current or noncurrent liabilities in the Condensed Consolidated Balance Sheets at their respective fair values. Unrealized gains and losses related to derivatives are recorded in the Condensed Consolidated Statements of Operations, or in other comprehensive income (loss), net of applicable income taxes, depending on the purpose for which the derivative is held. At the inception of a hedge transaction, we formally document the hedge relationship and the risk management objective for undertaking the hedge. In addition, we assess both at inception of the hedge and on an ongoing basis, whether the derivative in the hedging transaction has been highly effective in offsetting changes in fair value or cash flows of the hedged item and whether the derivative is expected to continue to be highly effective. The impact of any ineffectiveness is also recognized in the Condensed Consolidated Statements of Operations.

We are exposed to the impact of foreign currency fluctuations based on our global operations. The exposure to foreign currency movements within many countries is limited because the operating revenues and expenses of our various subsidiaries and business units are substantially in the local currency of the country in which they operate. To the extent borrowings, sales, purchases, revenues, expenses or other transactions are not in the local currency of the subsidiary or operating unit, we are exposed to currency risk. Periodically, we use foreign exchange spot and forward contracts to hedge exposures resulting from foreign exchange fluctuations. To the extent the gains and losses associated with the fair values of foreign currency exchange contracts are recognized in the Condensed Consolidated Statements of Operations, they are generally offset by gains and losses on underlying payables, receivables and net investments in foreign subsidiaries. We do not use derivative financial instruments for trading or speculative purposes. The aggregate notional value of the forward contracts at September 30, 2019 and December 31, 2018 was $144.4 million and $170.8 million, respectively. The fair values of foreign currency contracts were determined to be Level 2 under the fair value hierarchy and are valued using market exchange rates.

The total fair value of our foreign currency contracts, which were the only derivatives not designated as hedges, included in Prepaid expenses and other current assets at September 30, 2019 and December 31, 2018, was $0.2 million and $0.9 million, respectively. In addition, there was $3.0 million and $0.3 million of these derivatives included in Accrued liabilities and other at September 30, 2019 and December 31, 2018, respectively.