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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data (unaudited)
(in millions, except per share amounts):
 
Year Ended December 31, 2013
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
 
Operating revenues
$
495.2

 
$
485.1

 
$
480.2

 
$
500.1

 
$
1,960.6

 
Out-of-pocket reimbursements
187.2

 
172.0

 
171.6

 
167.2

 
698.0

 
Total revenues
682.4

 
657.1

 
651.8

 
667.3

 
2,658.6

 
Cost and expenses
574.6

 
551.3

 
531.4

 
544.8

 
2,202.1

 
Depreciation and amortization
33.2

 
33.1

 
34.1

 
42.9

 
143.3

 
Income from operations
74.6

 
72.7

 
86.3

 
79.6

 
313.2

 
Interest expense
(9.6
)
 
(9.3
)
 
(8.4
)
 
(7.2
)
 
(34.5
)
 
Other income, net
73.2

 
28.4

 
73.4

 
68.2

 
243.2

 
Equity in earnings of unconsolidated affiliates
5.6

 
9.5

 
3.8

 
4.1

 
23.0

 
Income before income taxes and non-controlling interest
143.8

 
101.3

 
155.1

 
144.7

 
544.9

 
Income taxes
50.6

 
22.8

 
58.2

 
60.7

 
192.3

 
Net income
$
93.2

 
$
78.5

 
$
96.9

 
$
84.0

 
$
352.6

 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
44.3

 
43.7

 
42.9

 
42.1

 
43.2

 
Basic earnings per share
$
2.10

 
$
1.80

 
$
2.26

 
$
2.00

 
$
8.15

(1)
Weighted average diluted shares outstanding
45.6

 
44.5

 
43.5

 
42.6

 
44.1

 
Diluted earnings per share
$
2.04

 
$
1.77

 
$
2.23

 
$
1.97

 
$
8.00

(1)
Cash dividends per share of common stock
$
0.30

 
$
0.30

 
$
0.30

 
$
0.30

 
$
1.20

 

_______________________________________________________________________
(1)
Earnings per share are computed independently for each of the quarters presented. Accordingly, the accumulation of 2013 quarterly earnings per share may not equal the total computed for the year.

 
Year Ended December 31, 2012
 
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
 
Operating revenues
$
475.9

 
$
465.5

 
$
464.0

 
$
487.0

 
$
1,892.4

 
Out-of-pocket reimbursements
177.3

 
167.3

 
168.0

 
171.6

 
684.2

 
Total revenues
653.2

 
632.8

 
632.0

 
658.6

 
2,576.6

 
Cost and expenses
559.1

 
539.6

 
544.4

 
559.8

 
2,202.9

 
Depreciation and amortization (including goodwill impairment)
34.0

 
42.3

 
40.5

 
99.6

 
216.4

 
Income (loss) from operations
60.1

 
50.9

 
47.1

 
(0.8
)
 
157.3

 
Interest expense
(11.7
)
 
(11.7
)
 
(10.6
)
 
(9.5
)
 
(43.5
)
 
Other income, net
29.7

 
194.2

 
72.4

 
77.2

 
373.5

 
Equity in earnings of unconsolidated affiliates
5.3

 
1.4

 
3.1

 
22.4

 
32.2

 
Income before income taxes and non-controlling interest
83.4

 
234.8

 
112.0

 
89.3

 
519.5

 
Income taxes
28.1

 
89.9

 
26.1

 
51.4

 
195.5

 
Net income
$
55.3

 
$
144.9

 
$
85.9

 
37.9

 
$
324.0

 
 
 
 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
44.5

 
45.0

 
45.1

 
45.0

 
44.9

 
Basic earnings per share
$
1.24

 
$
3.22

 
$
1.90

 
$
0.84

 
$
7.22

(1)
Weighted average diluted shares outstanding
45.2

 
45.7

 
46.0

 
46.1

 
45.8

 
Diluted earnings per share
$
1.22

 
$
3.17

 
$
1.87

 
$
0.82

 
$
7.08

(1)
Cash dividends per share of common stock
$
0.40

 
$
—

 
$
—

 
$
0.40

 
$
0.80

 
_______________________________________________________________________
(1)
Earnings per share are computed independently for each of the quarters presented. Accordingly, the accumulation of 2012 quarterly earnings per share may not equal the total computed for the year.