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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 29, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit, amount outstanding |  | $ 39,700,000 |  |  |
Commercial paper, maximum aggregate amount outstanding permitted |  | 1,000,000,000 |  |  |
Commercial paper, amount outstanding |  | $ 0 |  |  | $ 0
Maximum [Member] | Commercial Paper [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity period of debt |  | 397 days |  |  |
1.95% Senior Notes Due 2028 | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  | Aug. 01, 2028 |  |  |
Senior notes |  | $ 400,000,000.0 |  | $ 400,000,000 | 0
Percentage interest on debt instrument |  | 1.95% |  |  |
Debt Instrument Percentage Aggregate Offering Price Percentage |  |  |  | 99.805% |
2.4% Senior Notes Due 2031 | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  | Aug. 01, 2031 |  |  |
Senior notes |  | $ 450,000,000.0 |  | $ 450,000,000 | 0
Percentage interest on debt instrument |  | 2.40% |  |  |
Debt Instrument Percentage Aggregate Offering Price Percentage |  |  |  | 99.735% |
3.35% Senior Notes Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payment of 3.35% Senior Notes due 2021 |  | $ 300,000,000.0 | $ 0 |  |
3.35% Senior Notes Due 2021 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  | Jan. 15, 2021 |  |  |
Senior notes |  | $ 0 |  |  | 300,000,000.0
Percentage interest on debt instrument |  | 3.35% |  |  |
Payment of 3.35% Senior Notes due 2021 | $ 300,000,000 |  |  |  |
Revolving Credit Facility Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  | $ 1,800,000,000 |  |  |
Additional borrowing capacity under accordion feature of revolving credit facility |  | 500,000,000 |  |  |
Revolving credit facility, amount outstanding |  | 0 |  |  | 0
Revolving credit facilities letter of credit sublimit |  | 200,000,000 |  |  |
Additional borrowing capacity under the revolving credit facility |  | $ 1,800,000,000 |  |  |
Leverage ratio, minimum threshold, credit spread (example) |  | 2.0 |  |  |
Leverage ratio, maximum threshold, credit spread (example) |  | 3.25 |  |  |
Leverage ratio, minimum threshold, increase in credit spread (example) |  | 3.25 |  |  |
Impact on credit spread from increase in leverage ratio (example) |  | 0.125% |  |  |
Revolving Credit Facility Due 2025 [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.125% |  |  |
Revolving Credit Facility Due 2025 [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.20% |  |  |
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date |  | Mar. 26, 2025 |  |  |
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.125% |  |  |
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.50% |  |  |
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.125% |  |  |
Revolving Credit Facility Due 2025 [Member] | Line of Credit [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.50% |  |  |
Other Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Finance leases and other debt obligations included in long-term debt |  | $ 153,300,000 |  |  | $ 116,600,000

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- Definition Example of the minimum, inclusive, leverage ratio, as defined in the credit agreement, in which a credit spread on the revolver would increase based on the pricing terms outlined in the agreement. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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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. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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