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Equity - Additional Information (Details) - USD ($) $ in Millions			9 Months Ended
		Oct. 19, 2017	Sep. 30, 2017	Sep. 30, 2016
Dividends Payable [Line Items]
Dividend paid	[1]		$ 66.6	$ 66.4
Shares repurchased under repurchase program (in shares)			0
Stock repurchase program, remaining authorized repurchase amount			$ 238.8
Subsequent Event
Dividends Payable [Line Items]
Dividend paid		$ 22.3
[1] See Note 13 regarding quarterly cash dividend.

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Amount remaining of a stock repurchase plan authorized.

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