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Selected Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (unaudited)
 
 
First
 Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
 
Total
 
In millions, except per share data
2013
 
 
 
 
 
 
 
 
 
Total revenues
$
272.3

 
$
338.9

 
$
353.2

 
$
356.6

 
$
1,321.0

Net income
$
27.1

 
$
35.1

 
$
53.8

 
$
53.3

 
$
169.3

Per Share Data (1)
 
 
 
 
 
 
 
 
 
Basic
$
0.58

 
$
0.75

 
$
1.16

 
$
1.16

 
$
3.64

Diluted
$
0.57

 
$
0.74

 
$
1.15

 
$
1.14

 
$
3.59

2012
 
 
 
 
 
 
 
 
 
Total revenues
$
256.5

 
$
323.1

 
$
331.9

 
$
331.7

 
$
1,243.2

Net income
$
30.3

 
$
23.5

 
$
53.8

 
$
29.7

 
$
137.3

Per Share Data (1)
 
 
 
 
 
 
 
 
 
Basic
$
0.65

 
$
0.50

 
$
1.15

 
$
0.63

 
$
2.93

Diluted
$
0.64

 
$
0.49

 
$
1.13

 
$
0.62

 
$
2.88

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(1)
Quarterly earnings per share may not be additive, as per share amounts are computed independently for each quarter and the full year is based on the respective weighted average common shares and common stock equivalents outstanding.