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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 28, 2019	Feb. 25, 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Events
Cash dividends declared per share of common stock			$ 0.22	$ 0.22	$ 0.22	$ 0.21	$ 0	$ 0.42	$ 0.21	$ 0.18	$ 0.87	$ 0.81	$ 0.70
Diluted			$ 0.28	$ 0.95	$ 0.94	$ 0.54	$ 0.27	$ 0.59	$ 0.59	$ 0.48	$ 2.72	$ 1.94	$ 1.86
Subsequent Event
Subsequent Events
Cash dividends declared per share of common stock	$ 0.22
Dividends	$ 9.8
Accelerated share repurchases program, amount	$ 100.0
Other General and Administrative Expense		$ 2.9
Increase (Decrease) In Earning Per Share, Diluted		$ 2.78
Diluted		$ 2.72

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

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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