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Debt, U.S. Senior Notes (Details) - USD ($) $ in Millions |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 09, 2019 | Jan. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt |  |  |  |  |
Repayments of long-term debt |  |  | $ 757.8 | $ 3.0 |
U.S. Senior Notes |  |  |  |  |
Debt |  |  |  |  |
Redemption price as a percentage of principal amount |  |  | 100.00% |  |
2.20% Senior Notes due April 2020 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 2.20% |  | 2.20%
2.55% Senior Notes due January 2019 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  | 2.55% | 2.55% |  | 2.55%
Repayments of long-term debt |  | $ 750.0 |  |  |
4.350% Senior Notes due June 2029 |  |  |  |  |
Debt |  |  |  |  |
Redemption price as a percentage of principal amount | 100.00% |  |  |  |
Debt instrument, principal amount | $ 500.0 |  |  |  |
Stated interest rate (as a percent) | 4.35% |  |  |  |
Debt instrument, face amount, net of discount (as a percent) | 99.904% |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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