Derivatives and Hedging	9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging	Derivatives and Hedging The Company is exposed to various risks arising from business operations and market conditions, including fluctuations in interest rates and certain foreign currencies. When deemed appropriate, the Company uses derivative and non-derivative instruments as risk management tools to mitigate the potential impact of interest rate and foreign exchange rate risks. The objective of using these tools is to reduce fluctuations in the Company’s earnings and cash flows associated with changes in these rates. Derivative financial instruments are not used for trading or other speculative purposes. The Company has not historically incurred, and does not expect to incur in the future, any losses as a result of counterparty default related to derivative instruments. The Company formally documents relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. This process includes linking cash flow hedges to specific forecasted transactions or variability of cash flow to be paid. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the designated derivative and non-derivative instruments that are used in hedging transactions are highly effective in offsetting changes in the cash flows of the hedged items. When a designated instrument is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable, hedge accounting is discontinued prospectively. Cash Flow Hedge In July 2018, the Company entered into an interest rate swap to mitigate variability in forecasted interest payments on $500,000 of the Company’s U.S. dollar-denominated unsecured variable rate debt. The interest rate swap effectively converts a portion of the floating rate interest payment into a fixed rate interest payment. The Company designated the interest rate swap as a qualifying hedging instrument and is accounting for this derivative as a cash flow hedge. The fair value of the interest rate cash flow hedge was not material as of September 30, 2018. Gains or losses related to the interest rate cash flow hedge were not material during the three or nine months ended September 30, 2018. Hedges of Net Investments in Foreign Operations In July 2018, concurrent with the cash flow hedge described above, the Company entered into a cross-currency interest rate swap agreement to effectively convert $500,000 of the U.S. dollar-denominated unsecured variable rate debt to fixed-rate Euro-denominated debt. The risk management objective of this transaction is to manage foreign currency risk relating to a European subsidiary and reduce the variability in the functional currency equivalent cash flows of the unsecured variable rate debt. The Company designated the cross-currency interest rate swap as a qualifying hedging instrument and is accounting for this derivative as a hedge of the foreign currency exchange rate exposure of an equal amount to the Company's Euro-denominated net investment in a European subsidiary. The fair value of the cross currency interest rate hedge was not material as of September 30, 2018. Gains or losses related to the cross-currency swap agreement were not material during the three or nine months ended September 30, 2018. As of September 30, 2018, the Company also had designated €700,000 of the face value of Euro-denominated debt, a non-derivative financial instrument, as a hedge of the foreign currency exchange rate exposure of an equal amount to the Company's euro-denominated net investment in a European subsidiary. As of September 30, 2018, the Euro-denominated debt has a total carrying amount of $812,280, which is included in long-term debt in the Company’s condensed consolidated balance sheet. For the three and nine months ended September 30, 2018, the Company recorded a gain, net of tax, of approximately $4,088 and $20,133, respectively, in the cash flow and net investment hedges section of accumulated other comprehensive income (loss) in the Company’s condensed consolidated statements of income and comprehensive income. The Company did not reclassify any gains or losses related to net investment hedges from accumulated other comprehensive loss into earnings during the three or nine months ended September 30, 2018. Amounts would only be reclassified into earnings if the European subsidiary were liquidated, or otherwise disposed.

Derivatives and Hedging

The Company is exposed to various risks arising from business operations and market conditions, including fluctuations in interest rates and certain foreign currencies. When deemed appropriate, the Company uses derivative and non-derivative instruments as risk management tools to mitigate the potential impact of interest rate and foreign exchange rate risks. The objective of using these tools is to reduce fluctuations in the Company’s earnings and cash flows associated with changes in these rates. Derivative financial instruments are not used for trading or other speculative purposes. The Company has not historically incurred, and does not expect to incur in the future, any losses as a result of counterparty default related to derivative instruments.

The Company formally documents relationships between hedging instruments and hedged items, as well as the risk management objective and strategy for undertaking various hedge transactions. This process includes linking cash flow hedges to specific forecasted transactions or variability of cash flow to be paid. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the designated derivative and non-derivative instruments that are used in hedging transactions are highly effective in offsetting changes in the cash flows of the hedged items. When a designated instrument is determined not to be highly effective as a hedge or the underlying hedged transaction is no longer probable, hedge accounting is discontinued prospectively.

Cash Flow Hedge

In July 2018, the Company entered into an interest rate swap to mitigate variability in forecasted interest payments on $500,000 of the Company’s U.S. dollar-denominated unsecured variable rate debt. The interest rate swap effectively converts a portion of the floating rate interest payment into a fixed rate interest payment. The Company designated the interest rate swap as a qualifying hedging instrument and is accounting for this derivative as a cash flow hedge. The fair value of the interest rate cash flow hedge was not material as of September 30, 2018. Gains or losses related to the interest rate cash flow hedge were not material during the three or nine months ended September 30, 2018.

Hedges of Net Investments in Foreign Operations

In July 2018, concurrent with the cash flow hedge described above, the Company entered into a cross-currency interest rate swap agreement to effectively convert $500,000 of the U.S. dollar-denominated unsecured variable rate debt to fixed-rate Euro-denominated debt. The risk management objective of this transaction is to manage foreign currency risk relating to a European subsidiary and reduce the variability in the functional currency equivalent cash flows of the unsecured variable rate debt. The Company designated the cross-currency interest rate swap as a qualifying hedging instrument and is accounting for this derivative as a hedge of the foreign currency exchange rate exposure of an equal amount to the Company's Euro-denominated net investment in a European subsidiary. The fair value of the cross currency interest rate hedge was not material as of September 30, 2018. Gains or losses related to the cross-currency swap agreement were not material during the three or nine months ended September 30, 2018.

As of September 30, 2018, the Company also had designated €700,000 of the face value of Euro-denominated debt, a non-derivative financial instrument, as a hedge of the foreign currency exchange rate exposure of an equal amount to the Company's euro-denominated net investment in a European subsidiary. As of September 30, 2018, the Euro-denominated debt has a total carrying amount of $812,280, which is included in long-term debt in the Company’s condensed consolidated balance sheet. For the three and nine months ended September 30, 2018, the Company recorded a gain, net of tax, of approximately $4,088 and $20,133, respectively, in the cash flow and net investment hedges section of accumulated other comprehensive income (loss) in the Company’s condensed consolidated statements of income and comprehensive income.

The Company did not reclassify any gains or losses related to net investment hedges from accumulated other comprehensive loss into earnings during the three or nine months ended September 30, 2018. Amounts would only be reclassified into earnings if the European subsidiary were liquidated, or otherwise disposed.