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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Component of income from continuing operations and share data used in basic and diluted earnings per share The following reflects income from continuing operations and share data used in the basic and diluted earnings per share computations using the two-class method:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions except share and per share amounts)
 
2017
 
2016
 
2017
 
2016
Income (loss) from continuing operations
 
$
86.4

 
$
(9.5
)
 
$
250.2

 
$
174.3

Less: dividends declared - common stock outstanding, restricted shares and restricted share units
 
(23.2
)
 
(22.8
)
 
(69.0
)
 
(61.8
)
Undistributed earnings
 
63.2

 
(32.3
)
 
181.2

 
112.5

Percent allocated to common shareholders (1)
 
99.3
%
 
99.3
%
 
99.4
%
 
99.3
%
 
 
62.8

 
(32.1
)
 
180.1

 
111.7

Add: dividends declared - common stock
 
23.2

 
22.6

 
68.1

 
61.1

Income (loss) from continuing operations attributable to common shares
 
$
86.0

 
$
(9.5
)
 
$
248.2

 
$
172.8

 
 
 
 
 
 
 
 
 
Shares (in thousands):
 
 
 
 
 
 

 
 

Weighted-average common shares outstanding 
 
62,432

 
64,353

 
63,503

 
64,206

Effect of dilutive securities:
 
 
 
 
 
 

 
 

Performance awards
 
82

 
—

(2 
) 
82

 
252

Stock options
 
283

 
—

(2 
) 
331

 
421

Adjusted weighted-average common shares outstanding and assumed conversion
 
62,797

 
64,353

 
63,916

 
64,879

 
 
 
 
 
 
 
 
 
Per share income from continuing operations attributable to common shares:
 
 
 
 
 
 

 
 

Basic
 
$
1.38

 
$
(0.15
)
 
$
3.91

 
$
2.69

Diluted
 
$
1.37

 
$
(0.15
)
 
$
3.89

 
$
2.66

 
 
 
 
 
 
 
 
 
(1)    Basic weighted-average common shares outstanding
 
62,432

 
64,353

 
63,503

 
64,206

Basic weighted-average common shares outstanding, unvested restricted shares expected to vest and restricted share units
 
62,846

 
64,809

 
63,918

 
64,662

Percent allocated to common shareholders
 
99.3
%
 
99.3
%
 
99.4
%
 
99.3
%

(2) Performance awards and stock options representing approximately 252,000 and 326,000 shares, respectively, for the third quarter of 2016 were excluded from adjusted weighted-average common shares outstanding and assumed conversion for purposes of calculating diluted per share loss from continuing operations as they were anti-dilutive.
Component of income (loss) from discontinued operations and share data used in basic and diluted earnings per share Income from discontinued operations and net income used in the basic and diluted earnings per share computations were as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions except share amounts presented in thousands)
 
2017
 
2016
 
2017
 
2016
(Loss) income from discontinued operations attributable to common shareholders for basic and diluted earnings per share
 
$
(0.1
)
 
$
(0.3
)
 
$
0.2

 
$
(0.4
)
Net income (loss) attributable to common shareholders for basic and diluted earnings per share
 
$
85.9

 
$
(9.8
)
 
$
248.4

 
$
172.4

Anti-dilutive stock options excluded from EPS calculation (1)
 
377

 
1

 
328

 
125

 
 
 
 
 
 
 
 
 
(1) Represents stock options excluded from the calculation of diluted earnings per share, as such, options’ assumed proceeds upon exercise would result in the repurchase of more shares than the underlying award.