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Debt - Long-term Borrowings (Details) € in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | Aug. 31, 2017 EUR (€) | Jun. 02, 2017 USD ($) | May 16, 2017 USD ($) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt maturing in 2020 |  |  | $ 430,100,000 |  |  |  |  |  |  |
Long-term debt maturing in 2021 |  |  | 275,200,000 |  |  |  |  |  |  |
Long-term debt maturing in 2022 |  |  | 1,160,400,000 |  |  |  |  |  |  |
Long-term debt maturing in 2023 |  |  | 300,000 |  |  |  |  |  |  |
Long-term debt maturing in 2024 |  |  | 500,100,000 |  |  |  |  |  |  |
Interest expense on long-term debt |  |  | 321,300,000 | $ 343,100,000 | $ 257,400,000 |  |  |  |  |
Loss on extinguishment of debt |  |  | 14,800,000 |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Reduction in interest expense due to amortization of unrealized gain |  |  | $ 7,800,000 |  |  |  |  |  |  |
Reduction in interest expense due to amortization of unrealized gain |  |  |  | $ 8,300,000 |  |  |  |  |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative pretax gain recognized in OCI |  | $ 87,600,000 |  |  |  |  |  |  |  |
Bridge Loan | Committed Acquisition Financing |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 7,300,000,000
Senior Notes | 2.25% Senior Notes Due May 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt repurchased | $ 1,010,000,000.000 |  |  |  |  | $ 60,900,000 |  |  |  |
Interest rate | 2.25% |  |  |  |  | 2.25% |  |  |  |
Loss on extinguishment of debt | $ 14,800,000 |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes 2.75%, Due June 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt repurchased | $ 490,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate | 2.75% |  |  |  |  |  |  |  |  |
Senior Notes | 2.95% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 2.95% |  | 2.95% |  |  |  |  |  |  |
Long-term debt issued | $ 800,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes | 3.80% Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate | 3.80% |  | 3.80% |  |  |  |  |  |  |
Long-term debt issued | $ 550,000,000.0 |  |  |  |  |  |  |  |  |
Senior Notes | New Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  |  |  | $ 6,000,000,000.0 |
Senior Notes | Exchange Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt issued |  |  |  |  |  |  |  | $ 1,478,000,000 |  |
Debentures | Floating Rate Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt issued | € |  |  |  |  |  |  | € 225.0 |  |  |
Debentures | 0.92% Fixed Rate Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 0.92% |  |  |  | 0.92% |  |  |
Long-term debt issued | € |  |  |  |  |  |  | € 20.0 |  |  |
Term Loan | Committed Acquisition Financing |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0

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