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Quarterly financial data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Quarterly financial information for the years ended December 31, 2019 and 2018 is presented in the following tables:
 
Quarter Ended
(in millions, except per share data)
March 31,
 
June 30,
 
September 30,
 
December 31,
2019:
 

 
 

 
 

 
 

Revenue
$
190.6

 
$
243.2

 
$
311.8

 
$
360.4

Income (loss) from operations
(27.4
)
 
(7.0
)
 
70.7

 
77.8

Net income (loss)
(26.1
)
 
(9.5
)
 
43.2

 
46.9

 
 
 
 
 
 
 
 
Net income (loss) per share-basic
$
(0.51
)
 
$
(0.18
)
 
$
0.84

 
$
0.91

Net income (loss) per share-diluted
$
(0.51
)
 
$
(0.18
)
 
$
0.83

 
$
0.90

 
 
 
 
 
 
 
 
2018:
 
 
 
 
 
 
 
Revenue
$
117.8

 
$
220.2

 
$
173.7

 
$
270.7

Income (loss) from operations
(9.5
)
 
66.8

 
21.3

 
11.2

Net income (loss)
(4.9
)
 
50.1

 
20.9

 
(3.4
)
 
 
 
 
 
 
 
 
Net income (loss) per share-basic
$
(0.10
)
 
$
1.00

 
$
0.42

 
$
(0.07
)
Net income (loss) per share-diluted
$
(0.10
)
 
$
0.98

 
$
0.41

 
$
(0.07
)