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

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Dec. 07, 2018	Nov. 23, 2018	Oct. 23, 2018	Oct. 17, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions					$ 94.4	$ 39.6
Dividends [Domain]
Subsequent Event [Line Items]
Dividends Payable, Date Declared				Oct. 17, 2018
Quarterly dividend, value per share	$ 0.16
Quarterly dividend, date to be paid	Dec. 07, 2018
Quarterly dividend, date of record		Nov. 23, 2018
Quarterly dividend, amount declared	$ 22.1
Subsequent Event
Subsequent Event [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions			$ (33.0)