Fair Value Measurements and Derivative Instruments (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Sep. 30, 2019
Derivative [Line Items]
Collateral outstanding		$ 0
Notes due December 2020 \| New Term Loan
Derivative [Line Items]
Loan amount		300,000,000
Foreign exchange contracts
Derivative [Line Items]
Derivative notional amount	$ 8,000,000	8,000,000
Interest Rate Swap \| Cash Flow Hedging
Derivative [Line Items]
Derivative notional amount		$ 300,000,000
Investment Concentration Risk \| Commercial paper \| Level 2
Derivative [Line Items]
Percent of investments that is classified as commercial paper	3.00%

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Nominal or face amount used to calculate payment on derivative.

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