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Debt - Summary of Debt (Parenthetical) (Details) - Senior Notes - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 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	$ 0.8	$ 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	$ 1.6	$ 1.6

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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/presentationRef
-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

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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