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Earnings per share (Tables)
12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Basic and diluted weighted average shares outstanding and earnings per share were as follows:
 
 
Twelve Months Ended December 31,
(in millions)
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Earnings per share - basic
 
 
 
 
 
 
Earnings (loss) available to common shareholders
 
$
120.6

 
$
5.9

 
$
(12.5
)
Weighted average shares outstanding
 
182.6

 
165.3

 
147.3

Earnings (loss) per share - basic
 
$
0.66

 
$
0.04

 
$
(0.09
)
 
 
 
 
 
 
 
Earnings per share - diluted
 
 
 
 
 
 
Earnings (loss) available to common shareholders
 
$
120.6

 
$
5.9

 
$
(12.5
)
 
 
 
 
 
 
 
Weighted average shares outstanding
 
182.6

 
165.3

 
147.3

Dilutive impact of stock based awards
 
2.0

 
1.5

 

Weighted average dilutive shares outstanding
 
184.6

 
166.8

 
147.3

Earnings (loss) per share - diluted
 
$
0.65

 
$
0.04

 
$
(0.09
)