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Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2013
Marketable Securities [Abstract]  
Summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading
The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading at December 31, 2012 and June 30, 2013:
 
Available-for-Sale
 
Trading
 
December 31,
2012
 
June 30,
2013
 
December 31,
2012
 
June 30,
2013
Cost
$
103.2

 
$
102.8

 
$
10.3

 
$
18.1

Unrealized Gains
15.3

 
4.1

 
6.5

 
2.4

Unrealized Losses
(3.2
)
 
(7.3
)
 
(3.2
)
 
—

Fair Value
$
115.3

 
$
99.6

 
$
13.6

 
$
20.5
Summary of the Company's realized gains and losses on investments classified as available-for-sale and trading
The following is a summary of the Company's realized gains and losses on investments classified as available-for-sale and trading:
 
Available-for-Sale
 
Trading
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
Gains
$
—

 
$
1.9

 
$
—

 
$
2.1

 
$
0.1

 
$
0.3

 
$
0.6

 
$
0.4

Losses
—

 
—

 
—

 
—

 
—

 
—

 
(0.3
)
 
—

Net realized gains
$
—

 
$
1.9

 
$
—

 
$
2.1

 
$
0.1

 
$
0.3

 
$
0.3

 
$
0.4