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Other Comprehensive Income
 6 Months Ended
Jun. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Other Comprehensive Income
Other Comprehensive Income
 
The following tables present the changes in the balances of each component of accumulated other comprehensive income.
 
Three Months Ended June 30, 2012
 
 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, March 31, 2012
$
395.9

 
$
(6.8
)
 
$
9.3

 
$
398.4

Other comprehensive income (loss)
32.3

 
(1.2
)
 
(0.1
)
 
31.0

Balance, June 30, 2012
$
428.2

 
$
(8.0
)
 
$
9.2

 
$
429.4

 
Three Months Ended June 30, 2011
 
 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, March 31, 2011
$
83.2

 
$
(6.5
)
 
$
9.7

 
$
86.4

Other comprehensive income (loss)
119.0

 
0.3

 
(0.1
)
 
119.2

Balance, June 30, 2011
$
202.2

 
$
(6.2
)
 
$
9.6

 
$
205.6


Six Months Ended June 30, 2012

 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, December 31, 2011
$
366.7

 
$
(8.6
)
 
$
9.4

 
$
367.5

Other comprehensive income (loss)
61.5

 
0.6

 
(0.2
)
 
61.9

Balance, June 30, 2012
$
428.2

 
$
(8.0
)
 
$
9.2

 
$
429.4


Six Months Ended June 30, 2011

 
Net Unrealized
Gains (Losses) on
Investments
 
Cumulative
Translation
Adjustment
 
Cash Flow Hedge
 
Total Accumulated
Other
Comprehensive
Income
 
(in millions)
Balance, December 31, 2010
$
109.7

 
$
(7.7
)
 
$
9.8

 
$
111.8

Other comprehensive income (loss)
92.5

 
1.5

 
(0.2
)
 
93.8

Balance, June 30, 2011
$
202.2

 
$
(6.2
)
 
$
9.6

 
$
205.6