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Stock-based Compensation - PRSU And RSU Activity And Related Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Performance-based Restricted Stock Units
Shares
Beginning balance (in shares)	1.7	1.9
Granted (in shares)	1.6	0.2
Vested (in shares)	(0.2)	(0.1)
Forfeited/Terminated (in shares)	(0.4)	(0.3)
Ending balance (in shares)	2.7	1.7
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 68.02	$ 68.17
Granted (in dollars per share)	59.64	60.78
Vested (in dollars per share)	59.39	51.87
Forfeited/Terminated (in dollars per share)	65.48	70.43
Ending balance (in dollars per share)	$ 64.13	$ 68.02
Restricted Stock Units and Deferred Stock Units
Shares
Beginning balance (in shares)	0.4	0.1
Granted (in shares)	0.4	0.3
Vested (in shares)	(0.1)	0.0
Forfeited/Terminated (in shares)	(0.1)	0.0
Ending balance (in shares)	0.6	0.4
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 59.37	$ 66.41
Granted (in dollars per share)	68.08	53.77
Vested (in dollars per share)	54.20	60.17
Forfeited/Terminated (in dollars per share)	64.66	53.45
Ending balance (in dollars per share)	$ 64.94	$ 59.37
Intrinsic value	$ 41.7

X

- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to equity instruments other than stock options outstanding under the plan as of the balance sheet date.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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