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DEBT - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2020 USD ($) | May 12, 2016 USD ($) | Dec. 17, 2012 USD ($) | Jun. 18, 2007 USD ($) | May 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2018 USD ($) extension | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Apr. 10, 2020 | Nov. 15, 2019 USD ($) | Aug. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 4,402,200,000 | $ 3,403,100,000 |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 4,402,200,000 |  |  |  |  |  |
Line of credit facility, potential maximum borrowing capacity |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |
Maximum leverage ratio (not more than) |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |
Leverage ratio, maximum allowed increase following a material acquisition |  |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |
Leverage ratio, maximum allowed following a material acquisition |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  |  |
Commercial paper notes |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |
Cash paid for interest, net of capitalized interest |  |  |  |  |  |  |  |  | $ 130,900,000 | 105,300,000 | $ 88,200,000 |  |  |  |
June 30, 2020 through September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio (not more than) |  |  |  |  |  |  |  |  |  |  |  | 4.5 |  |  |
Fiscal quarter ending December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio (not more than) |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |
March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio (not more than) |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, maturity period range |  |  |  |  |  | 397 days |  |  |  |  |  |  |  |  |
Notes, 2.60%, due December 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) | 2.60% |  |  |  |  |  |  |  | 2.60% |  |  |  |  |  |
Debt outstanding | $ 400,000,000.0 |  |  |  |  |  |  |  | $ 400,000,000.0 | 0 |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes, 3.1%, due May 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) | 3.10% |  |  |  |  |  |  |  | 3.10% |  |  |  |  |  |
Debt outstanding | $ 600,000,000.0 |  |  |  |  |  |  |  | $ 600,000,000.0 | $ 0 |  |  |  |  |
Debt instrument, term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes, 2.60%, due December 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.60% | 2.60% |  |  | 2.60% |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 750,000,000.0 | $ 750,000,000.0 |  |  | $ 750,000,000.0 |  |
Debt instrument, term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Notes, 3.60%, due Aug 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  | 3.60% |  |  |  | 3.60% | 3.60% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 300,000,000.0 | $ 300,000,000.0 |  |  |  |  |
Long-term debt |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |
Notes, 3.95%, due May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  | 3.95% |  |  |  | 3.95% | 3.95% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 400,000,000.0 | $ 400,000,000.0 |  |  |  |  |
Long-term debt |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |
Notes, Floating Rate, due Aug 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | 300,000,000.0 | $ 300,000,000.0 |  |  |  |  |
Long-term debt |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit, borrowings outstanding |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Credit facility, available for borrowings |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Receivables Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000,000.0
Notes, 2.30%, due June 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.30% | 2.30% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |  |  |
Notes, 2.30%, due June 2021 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  | 2.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes, 3.25%, due June 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.25% | 3.25% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 275,000,000.0 | $ 275,000,000.0 |  |  |  |  |
Notes, 3.25%, due June 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 275,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes, 7.00%, due July 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 250,000,000.0 | $ 250,000,000.0 |  |  |  |  |
Notes, 7.00%, due July 2037 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Notes, 3.30%, due Dec 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.30% | 3.30% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 500,000,000.0 | $ 500,000,000.0 |  |  |  |  |
Notes, 3.30%, due Dec 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debentures, 6.90%, due July 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.90% | 6.90% |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 125,000,000.0 | $ 125,000,000.0 |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 125,000,000.0 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Notes, Floating Rate, due Aug 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  | 0.87% |  |  |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  | $ 800,000,000.0 |  |  |  |  |  |  |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  | $ 900,000,000 |
Maximum number of extensions, maturity date | extension |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Credit facility, maturity date, extension period |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit, borrowings outstanding |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |

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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=120520924&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 Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + 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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- 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://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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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