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Equity - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended
		Apr. 21, 2016	Mar. 31, 2016	Mar. 31, 2015
Subsequent Event [Line Items]
Dividend paid	[1]		$ 22.1	$ 20.1
Stock repurchase program, remaining authorized repurchase amount			$ 250.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend paid		$ 22.2
Dividends payable, date to be paid		Apr. 21, 2016
[1] See Note 13 regarding quarterly cash dividend.

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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X

- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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X

- 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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