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Earnings (Loss) per Share - Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Reconciliation
Net income (loss)	$ 20.2	$ 56.8	$ 65.5	$ 79.5
Basic and Diluted earnings (loss) per share
Basic earnings (loss) per share (usd per share)	$ 0.49	$ 1.36	$ 1.58	$ 1.90
Diluted earnings (loss) per share (usd per share)	$ 0.49	$ 1.34	$ 1.57	$ 1.88
Shares
Weighted average number of common shares outstanding - Basic (in shares)	41,233	41,844	41,463	41,770
Weighted average additional shares assuming conversion of potential common shares (in shares)	137	358	199	440
Shares - diluted basis (in shares)	41,370	42,202	41,662	42,210

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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