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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions							3 Months Ended
	Oct. 11, 2019	Jul. 05, 2019	Apr. 12, 2019	Oct. 12, 2018	Jul. 06, 2018	Apr. 06, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Cash dividends declared (in dollars per share)							$ 0.10	$ 0.10	$ 0.06	$ 0.6	$ 0.06	$ 0.06
Cash dividends declared							$ 6.5	$ 6.6	$ 4.0	$ 4.1	$ 4.1	$ 4.0
Cash dividends paid (in dollars per share)		$ 0.10	$ 0.06	$ 0.06	$ 0.06	$ 0.06
Dividends paid on common stock		$ 6.6	$ 4.0	$ 4.1	$ 4.1	$ 4.0
Subsequent Event
Cash dividends paid (in dollars per share)	$ 0.10
Dividends paid on common stock	$ 6.5

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

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