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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Net Income, Weighted Average Common Shares Used in Calculating Basic Earnings Per Common Share and Diluted EPS The following table presents net income, the weighted average common shares used in calculating basic earnings per common share (“EPS”) and those used in calculating diluted EPS for each period presented below. 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
Numerator
 
 
 
 
 
 
 
Net (loss) income
$
(57.3
)
 
$
144.4

 
$
206.7

 
$
534.1

Deduct dividends paid
(28.8
)
 
(30.1
)
 
(88.8
)
 
(95.1
)
Undistributed (loss) earnings
$
(86.1
)
 
$
114.3

 
$
117.9

 
$
439.0

Denominator
 
 
 
 
 
 
 
Weighted average shares outstanding used in basic earnings per share
54,524,874

 
60,262,073

 
55,096,933

 
62,522,980

Incremental common shares from:
 
 
 
 
 
 
 
PSUs
—

 
566,268

 
312,275

 
570,340

Employee Stock Purchase Program
—

 
—

 
43

 
—

Weighted average shares used in diluted earnings per share calculations
54,524,874

 
60,828,341

 
55,409,251

 
63,093,320

Earnings per common share - Basic
 
 
 
 
 
 
 
Distributed earnings
$
0.53

 
$
0.50

 
$
1.61

 
$
1.52

Undistributed (loss) earnings
(1.58
)
 
1.90

 
2.14

 
7.02

Net (loss) income
$
(1.05
)
 
$
2.40

 
$
3.75

 
$
8.54

Earnings per common share - Diluted (1)
 
 
 
 
 
 
 
Distributed earnings
$
0.53

 
$
0.49

 
$
1.60

 
$
1.50

Undistributed (loss) earnings
(1.58
)
 
1.88

 
2.13

 
6.96

Net (loss) income
$
(1.05
)
 
$
2.37

 
$
3.73

 
$
8.46

(1)
In accordance with earnings per share guidance, diluted per share amounts are computed in the same manner as basic per share amounts when a loss from operations exists.