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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Reconciliation of information used in computing basic and diluted earnings per share
Basic and diluted earnings per share was computed as follows:
 
Years Ended December 31,
(in millions except share and per share amounts)
    2016 (1)
 
    2015 (1)(2)
 
    2014 (1)(2)
Earnings from continuing operations
$
19.1

 
$
16.5

 
$
119.6

Loss from discontinued operations, net
$
(61.4
)
 
$
(250.3
)
 
$
(206.6
)
Net loss
$
(42.3
)
 
$
(233.8
)
 
$
(87.0
)
 
 
 
 
 
 
Basic earnings (loss) per common share:
 
 
 
 
 
Earnings from continuing operations
$
0.22

 
$
0.19

 
$
1.41

Loss from discontinued operations, net
$
(0.70
)
 
$
(2.88
)
 
$
(2.43
)
Net loss
$
(0.48
)
 
$
(2.69
)
 
$
(1.02
)
 
 
 
 
 
 
Weighted average shares outstanding
88,667,098

 
86,802,828

 
85,046,042

 
 
 
 
 
 
Diluted earnings (loss) per common share:
 
 
 
 
 
Earnings from continuing operations
$
0.21

 
$
0.19

 
$
1.40

Loss from discontinued operations, net
$
(0.68
)
 
$
(2.88
)
 
$
(2.42
)
Net loss
$
(0.47
)
 
$
(2.69
)
 
$
(1.02
)
 
 
 
 
 
 
Diluted weighted-average shares outstanding
89,182,967

 
86,992,254

 
85,292,959