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Common Stock and Stock-Based Awards Plans - Dividends and Share Repurchase Authorization (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 14, 2020	Mar. 31, 2020	Feb. 19, 2020	Oct. 26, 2018	Mar. 06, 2018
Dividends Payable [Line Items]
Quarterly cash dividend declared		$ 0.16
Dividend declared date		Mar. 16, 2020
Dividend record date		Mar. 31, 2020
Dividends paid		$ 5.5
Dividend paid date		Apr. 14, 2020
Equity Class Of Treasury Stock [Line Items]
Repurchase of common shares program authorized amount			$ 150.0	$ 100.0	$ 250.0
Repurchase of common shares remaining authorized amount		$ 210.1
Subsequent Event [Member]
Dividends Payable [Line Items]
Dividends paid	$ 5.8

X

- Definition

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

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Date the dividend to be paid was declared, in CCYY-MM-DD format.

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