Common Stock, Dividends, Per Share, Cash Paid for Dividends Declared in Prior Period

No definition available.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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-Section S99
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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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Shareholders' Equity (Details) - USD ($)	1 Months Ended		3 Months Ended										11 Months Ended	12 Months Ended
Shareholders' Equity (Details) - USD ($)	May 31, 2018	Apr. 30, 2017	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Feb. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders' Equity
Common stock dividends declared (in dollars per share)				$ 0.7	$ 0.7	$ 0.60	$ 0.60	$ 0.6	$ 0.6	$ 0.48	$ 0.48	$ 0.48		$ 2.60	$ 2.16	$ 1.71
Dividend declared and paid in same quarter (in dollars per share)										$ 0.48
Cash paid for dividends declared in prior period (in dollars per share)				$ 0.7	$ 0.6	$ 0.6	$ 0.6	$ 0.6	$ 0.48		$ 0.48
Term of stock repurchase program	24 months	12 months
Stock repurchase program, authorized amount	$ 1,000,000,000.0	$ 500,000,000
Total cost of treasury stock, acquired during the period													$ 500,000,000	$ 575,039,000	$ 224,998,000	$ 299,960,000
Subsequent event
Shareholders' Equity
Cash paid for dividends declared in prior period (in dollars per share)			$ 0.7
May 2018 Share Repurchase Program
Shareholders' Equity
Treasury stock, shares acquired (in shares)														2,800,000.0
Total cost of treasury stock, acquired during the period														$ 300,000,000
Remaining authorized repurchase amount				$ 700,000,000										$ 700,000,000
April 2017 Share Repurchase Program
Shareholders' Equity
Treasury stock, shares acquired (in shares)														2,100,000	1,800,000
Total cost of treasury stock, acquired during the period														$ 275,000,000	$ 225,000,000