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DEBT - Narrative (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2016 USD ($) | May 12, 2016 USD ($) | Dec. 17, 2012 USD ($) | Jun. 28, 2007 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) extension | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 2,654,900,000 |  | $ 2,654,900,000 |  |  |
Line of credit facility, potential maximum borrowing capacity |  |  |  |  |  |  | $ 1,600,000,000.00 |  |  |  |
Letters of credit outstanding |  |  |  |  |  | $ 15,500,000 |  | $ 15,500,000 |  |  |
Bridge loan, term | 364 days |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio (not more than) |  |  |  |  |  | 3.5 |  | 3.5 |  |  |
Leverage ratio, maximum allowed increase following a material acquisition |  |  |  |  |  | 0.5 |  | 0.5 |  |  |
Leverage ratio, maximum allowed following a material acquisition |  |  |  |  |  | 4.0 |  | 4.0 |  |  |
Commercial paper notes |  |  |  |  |  | $ 900,000,000.0 |  | $ 900,000,000.0 |  |  |
Debt outstanding |  |  |  |  |  | $ 2,654,900,000 |  | 2,654,900,000 | $ 2,715,300,000 |  |
Cash paid for interest, net of capitalized interest |  |  |  |  |  |  |  | $ 88,200,000 | 96,900,000 | $ 85,000,000 |
Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial paper, maturity period range |  |  |  |  |  |  |  | 397 days |  |  |
Notes, 3.60%, due Aug 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  | 3.60% | 3.60% |  | 3.60% |  |  |
Debt outstanding |  |  |  |  |  | $ 300,000,000 |  | $ 300,000,000 | 0 |  |
Notes, 3.95%, due May 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 400,000,000.0 |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  | 3.95% | 3.95% |  | 3.95% |  |  |
Debt outstanding |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 | 0 |  |
Notes, Floating Rate, due Aug 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 300,000,000.0 |  |  |  |  |  |
Debt outstanding |  |  |  |  |  | 300,000,000 |  | 300,000,000 | 0 |  |
Revolver |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit, borrowings outstanding |  |  |  |  |  | 0 |  | 0 |  |  |
Credit facility, available for borrowings |  |  |  |  |  | 1,080,000,000 |  | 1,080,000,000 |  |  |
Debt outstanding |  |  |  |  |  | 0 |  | 0 | 100,000,000 |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  | 0 |  | 0 | 562,600,000 |  |
Revolver 364 Day |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bridge loan |  |  |  |  |  |  |  | $ 800,000,000.0 |  |  |
Bridge loan, term | 364 days |  |  |  |  |  |  | 364 days |  |  |
Debt, extinguished | $ 475,000,000 |  |  |  |  |  |  |  |  |  |
Receivables Securitization Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  | $ 225,000,000.0 |  | $ 225,000,000.0 |  |  |
Debt instrument, term |  |  |  |  |  | 2 years |  |  |  |  |
Debt collateral |  |  |  |  |  | $ 209,800,000 |  | $ 209,800,000 |  |  |
Notes, 2.30%, due June 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  |  | 2.30% |  | 2.30% |  |  |
Debt outstanding |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 500,000,000 |  |
Notes, 2.30%, due June 2021 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  | 2.30% |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |  |  |  |
Notes, 3.25%, due June 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  |  | 3.25% |  | 3.25% |  |  |
Debt outstanding |  |  |  |  |  | $ 275,000,000 |  | $ 275,000,000 | 275,000,000 |  |
Notes, 3.25%, due June 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 275,000,000.0 |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  | 3.25% |  |  |  |  |  |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |  |  |  |  |  |
Notes, 6.30%, due July 2017 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 300,000,000.0 |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  | 6.30% |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 10 years |  |  |  |  |  |  |
Notes, 7.00%, due July 2037 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  |  | 7.00% |  | 7.00% |  |  |
Debt outstanding |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 | 250,000,000 |  |
Notes, 7.00%, due July 2037 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  | 7.00% |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 30 years |  |  |  |  |  |  |
Notes, 3.30%, due Dec 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long term debt, interest rate |  |  |  |  |  | 3.30% |  | 3.30% |  |  |
Debt outstanding |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 | 500,000,000 |  |
Notes, 3.30%, due Dec 2022 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 500,000,000.0 |  |  |  |  |  |  |  |
Long term debt, interest rate |  |  | 3.30% |  |  |  |  |  |  |  |
Debt instrument, term |  |  | 10 years |  |  |  |  |  |  |  |
Debentures, 6.90%, due July 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 125,000,000 |  | $ 125,000,000 |  |  |
Long term debt, interest rate |  |  |  |  |  | 6.90% |  | 6.90% |  |  |
Debt outstanding |  |  |  |  |  | $ 125,000,000 |  | $ 125,000,000 | $ 125,000,000 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  | $ 800,000,000.0 |  |  |  |
Debt instrument, term |  |  |  |  |  |  | 3 years |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  | $ 1,100,000,000.00 |  |  |  | $ 900,000,000
Debt instrument, term |  |  |  |  |  |  | 5 years |  |  |  |
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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