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Debt (Narrative) (Details) € in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jul. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	May. 09, 2013 USD ($)	Jul. 26, 2011 USD ($)
Line of Credit Facility [Line Items]
Outstanding Credit Facility balance	$ 549,000,000		$ 573,000,000
Credit Facility borrowings hedged			80,000,000
Consolidated Leverage Ratio Under Credit Facility & Note Payable, maximum		3.50%
Long-term Debt			597,085,000
Fair value of mortgage at inception	367,300,000		593,700,000
Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fees		0.25%
Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fees		0.075%
Senior Notes [Member]
Line of Credit Facility [Line Items]
Consolidated Leverage Ratio Under Credit Facility & Note Payable, maximum		3.50%
Notes Payable	150,000,000			$ 75,000,000	$ 125,000,000
Debt Instrument, Interest Rate, Stated Percentage				3.72%
Series A Senior Note [Member]
Line of Credit Facility [Line Items]
Notes Payable	$ 75,000,000				$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.25%				3.32%	3.94%
Debt Instrument, Term	7 years
Series B Senior Note [Member]
Line of Credit Facility [Line Items]
Notes Payable	$ 75,000,000				$ 75,000,000	$ 75,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.72%				3.76%	4.04%
Debt Instrument, Term	12 years
Series C Senior Note [Member]
Line of Credit Facility [Line Items]
Notes Payable		€ 88.9	$ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage		1.785%	1.785%
Shelf Notes [Member]
Line of Credit Facility [Line Items]
Notes Payable			$ 75,000,000
Debt Instrument, Term		12 years
Outdated Unsecured Short Term Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity								$ 700,000,000
Amended And Restated Unsecured Short Term Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity							$ 850,000,000
Credit Facility maturity date		Dec. 04, 2020
Outstanding Credit Facility balance	$ 549,000,000		$ 573,000,000
Credit Facility weighted average interest rates on outstanding balance	1.50%	1.90%	1.90%
Reduction of Credit Facility Availability	$ 1,000,000		$ 1,000,000
Minimum Credit Spread On LIBOR Or CDOR Borrowings [Member]
Line of Credit Facility [Line Items]
Credit spread during period		0.875%
Maximum Credit Spread On LIBOR Or CDOR Borrowings [Member]
Line of Credit Facility [Line Items]
Credit spread during period		1.375%
Maximum Credit Spread On Prime Rate Borrowings [Member]
Line of Credit Facility [Line Items]
Credit spread during period		0.375%
Uncommitted Shelf Facility [Member]
Line of Credit Facility [Line Items]
Notes Payable	$ 50,000,000
Uncommitted Shelf Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	15 years

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- Definition

Maximum consolidated leverage ratio permitted under debt agreements.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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