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(Loss) earnings per share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net (loss) earnings	$ (9.5)	$ 50.1	$ (35.6)	$ 45.2
Denominator:
Weighted-average number of shares-basic (in shares)	51,500,000	49,900,000	51,300,000	49,700,000
Dilutive securities-equity awards (in shares)	0	1,300,000	0	1,300,000
Weighted-average number of shares-diluted (in shares)	51,500,000	51,200,000	51,300,000	51,000,000.0
Net income per share - basic (in dollars per share)	$ (0.18)	$ 1.00	$ (0.69)	$ 0.91
Net income per share - diluted (in dollars per share)	$ (0.18)	$ 0.98	$ (0.69)	$ 0.89
Antidilutive securities excluded from computation of earnings per share	3,000,000		3,000,000.0

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