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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) | Dec. 31, 2018 | Oct. 01, 2018 | Aug. 28, 2018 | Dec. 31, 2017 | Dec. 19, 2016 | Dec. 07, 2015 | Jun. 06, 2013 | Nov. 21, 2012 | Sep. 30, 2009
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Total debt | $ 4,941,700,000 |  |  | $ 5,155,500,000 |  |  |  |  |
Less current portion | 1,500,000 |  |  | 800,900,000 |  |  |  |  |
Long-term debt | 4,940,200,000 |  |  | 4,354,600,000 |  |  |  |  |
$800 2.050% senior notes due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 800,000,000 |  |  |  |  |
Interest rate |  | 2.05% |  | 2.05% |  |  |  |  |
$500 6.250% senior notes due 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 500,000,000 |  |  |  |  |
Interest rate |  |  |  | 6.25% |  |  |  |  |
$600 3.000% senior notes due 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 600,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.00% |  |  |  |  |  |  |  |
$500 2.800% senior notes due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  |  |  |
Interest rate | 2.80% |  |  |  |  |  |  |  |
$500 3.125% senior notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 500,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.125% |  |  |  |  |  |  |  |
$700 3.650% senior notes due 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 700,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.65% |  |  |  |  |  |  |  |
$300 3.850% senior notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 300,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.85% |  |  |  |  |  |  |  |
$700 3.800% senior notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 700,000,000 |  |  |  |  |  |  |  |
Interest rate | 3.80% |  |  |  |  |  |  |  |
$800 4.200% senior notes due 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 800,000,000 |  |  |  |  |  |  |  |
Interest rate | 4.20% |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Face amount of debt | $ 3,000,000 |  |  |  |  |  |  |  |
Credit facility | 2016 Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 865,000,000 |  |  | $ 1,270,000,000 |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Less unamortized debt issuance costs | (26,300,000) |  |  | (17,600,000) |  |  |  |  |
Face amount of debt | 4,100,000,000 |  |  |  |  |  |  |  |
Senior notes | $800 2.050% senior notes due 2018 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 0 |  |  | 800,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 800,000,000 |  |
Interest rate |  |  |  |  |  |  | 2.05% |  |
Senior notes | $500 6.250% senior notes due 2019 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 0 |  |  | 500,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 500,000,000
Interest rate |  |  |  |  |  |  |  |  | 6.25%
Senior notes | $600 3.000% senior notes due 2020 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 600,000,000 |  |  | 600,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 600,000,000 |  |  |
Interest rate |  |  |  |  |  | 3.00% |  |  |
Senior notes | $500 2.800% senior notes due 2021 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 500,000,000 |  |  | 500,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  | $ 500,000,000 |  |  |  |
Interest rate |  |  |  |  | 2.80% |  |  |  |
Senior notes | $500 3.125% senior notes due 2022 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 500,000,000 |  |  | 500,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 500,000,000 |
Interest rate |  |  |  |  |  |  |  | 3.125% |
Senior notes | $700 3.650% senior notes due 2023 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 700,000,000 |  |  | 0 |  |  |  |  |
Face amount of debt |  |  | $ 700,000,000.0 |  |  |  |  |  |
Interest rate |  |  | 3.65% |  |  |  |  |  |
Senior notes | $300 3.850% senior notes due 2025 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 300,000,000 |  |  | 300,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 300,000,000 |  |  |
Interest rate |  |  |  |  |  | 3.85% |  |  |
Senior notes | $700 3.800% senior notes due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 700,000,000 |  |  | 700,000,000 |  |  |  |  |
Face amount of debt |  |  |  |  | $ 700,000,000 |  |  |  |
Interest rate |  |  |  |  | 3.80% |  |  |  |
Senior notes | $800 4.200% senior notes due 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | 800,000,000 |  |  | 0 |  |  |  |  |
Face amount of debt |  |  | $ 800,000,000.0 |  |  |  |  |  |
Interest rate |  |  | 4.20% |  |  |  |  |  |
Senior notes | Other |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt | $ 3,000,000 |  |  | $ 3,100,000 |  |  |  |  |

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