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Debt - Summary of Debt (Parenthetical) (Details) - Senior Notes - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
6.50% Senior Notes due March 2018 |  |
Debt Instrument [Line Items] |  |
Stated interest rate |  | 6.50%
Debt instrument, maturity date |  | Mar. 15, 2018
2.45% Senior Notes, due December 2020 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.45% | 2.45%
Debt instrument, maturity date | Dec. 15, 2020 | Dec. 15, 2020
Senior notes, discount | $ 0.4 | $ 0.5
3.90% Senior Notes, due June 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.90% | 3.90%
Debt instrument, maturity date | Jun. 15, 2022 | Jun. 15, 2022
Senior notes, discount | $ 0.1 | $ 0.2
4.50% Senior Notes, due November 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.50% | 4.50%
Debt instrument, maturity date | Nov. 01, 2023 | Nov. 01, 2023
Senior notes, discount | $ 1.1 | $ 1.2
3.65% Senior Notes, due September 2024 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.65% | 3.65%
Debt instrument, maturity date | Sep. 15, 2024 | Sep. 15, 2024
Senior notes, discount | $ 0.7 | $ 0.8
3.40% Senior Notes, due December 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.40% | 3.40%
Debt instrument, maturity date | Dec. 15, 2027 | Dec. 15, 2027
Senior notes, discount | $ 1.5 | $ 1.6

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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