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Long-Term Debt (Narrative) (Amended and Restated Senior Revolving Credit Facility) (Details)		12 Months Ended
	May 01, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015	Jun. 08, 2015	Apr. 30, 2015 USD ($)
Senior Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity					$ 800,000,000
Ability to increase the size of the facility, in increments		$ 0
Line of Credit, Increase, Additional Borrowings, Maximum		$ 500,000,000
Credit agreement financial covenants, maximum total leverage ratio		3.75
Credit agreement financial covenants, minimum interest coverage ratio		3.50
Senior Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 1,000,000,000.0	$ 15,000,000.0
Period of debt, in years	5 years
Ability to increase the size of the facility, in increments		10,000,000
Senior Revolving Credit Facility [Member] | Swingline Loans For Short Term Borrowings [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		15,000,000
Senior Revolving Credit Facility [Member] | Foreign Currency Sublimit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity		$ 75,000,000
1.00% Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		1.00%	1.00%
1.00% Notes [Member] | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		1.00%		1.00%

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- Definition

Credit agreement financial covenants, maximum leverage ratio

+ References

No definition available.

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Credit agreement financial covenants, minimum interest coverage ratio

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- Definition

Line of Credit, Increase, Additional Borrowings, Maximum

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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- Definition

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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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