Selected Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (unaudited)

	First Quarter		Second Quarter (2)		Third Quarter		Fourth Quarter (3)		Total
	In millions, except per share data
2019
Total revenues	$	317.0	$	359.4	$	360.7	$	356.7	$	1,393.8
Net income	$	41.5	$	68.0	$	45.1	$	56.6	$	211.2
Per Share Data (1)
Basic	$	1.14	$	1.89	$	1.28	$	1.62	$	5.92
Diluted	$	1.12	$	1.86	$	1.25	$	1.59	$	5.81
2018
Total revenues	$	305.3	$	349.5	$	349.7	$	356.4	$	1,360.9
Net income	$	76.3	$	38.8	$	47.0	$	49.2	$	211.3
Per Share Data (1)
Basic	$	2.02	$	1.03	$	1.25	$	1.32	$	5.62
Diluted	$	1.98	$	1.01	$	1.22	$	1.30	$	5.52

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(1) Quarterly earnings per share may not be additive, as per share amounts are computed independently for each quarter and the full year is based on the respective weighted-average common shares and common stock equivalents outstanding.

(2) In the second quarter of 2019, net income included a $2.8 million tax benefit from a deferred income tax adjustment due to an enacted corporate income tax rate decrease in Alberta, Canada. In the second quarter of 2018, net income included $5.8 million of expense (net of taxes) attributable to the closure of a maintenance facility.

(3) In the fourth quarter of 2019, net income included a $8.1 million net casualty gain (net of taxes) attributable to insurance recoveries for a heavily damaged vessel that was written off. In the fourth quarter of 2018, net income included $17.9 million of income tax benefits, primarily related to the impacts of the enacted Tax Act.