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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments
Carrying amounts and estimated fair values of financial instruments as of the dates indicated were as follows (in millions):     
 
December 31, 2012
 
December 31, 2011
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets
 
 
 
 
 
 
 
Cash surrender value of life insurance policies
$
11.9

 
$
11.9

 
$
10.6

 
$
10.6

Auction rate securities
14.4

 
14.4

 
13.6

 
13.6

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Deferred compensation plan liabilities
$
3.3

 
$
3.3

 
$
2.2

 
$
2.2

Acquisition-related contingent consideration
143.6

 
143.6

 
80.5

 
80.5

7.625% senior notes
150.0

 
154.9

 
150.0

 
156.4

Original 4.0% Notes
9.7

 
15.9

 
9.7

 
12.5

Original 4.25% Notes
3.0

 
5.1

 
3.0

 
4.0

New 4.0% Notes
100.9

 
101.5

 
98.2

 
99.4

New 4.25% Notes
92.1

 
92.7

 
89.9

 
91.1
Schedule Of Fair Values Of Financial Assets And Liabilities Measured On Recurring Basis
The fair values of financial assets and liabilities measured on a recurring basis were determined using the following inputs as of the dates indicated (in millions):
 
 
 
Fair Value Measurements
Using Inputs Considered as Significant
 
Fair Value as of
December 31, 2012
 
Level 1
 
Level 2
 
Level 3
Assets
 
 
 
 
 
 
 
Cash surrender value of life insurance policies
$
11.9

 
$
11.9

 
—

 
—

Auction rate securities
$
14.4

 
—

 
—

 
$
14.4

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Deferred compensation plan liabilities
$
3.3

 
$
3.3

 
—

 
—

Acquisition-related contingent consideration
$
143.6

 
—

 
—

 
$
143.6

 
 
 
 
 
 
 
 


 
 
Fair Value Measurements
Using Inputs Considered as Significant
 
Fair Value as of
December 31,
2011
 
Level 1
 
Level 2
 
Level 3
Assets
 
 
 
 
 
 
 
Cash surrender value of life insurance policies
$
10.6

 
$
10.6

 
—

 
—

Auction rate securities
$
13.6

 
—

 
—

 
$
13.6



 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Deferred compensation plan liabilities
$
2.2

 
$
2.2

 
—

 
—

Acquisition-related contingent consideration
$
80.5

 
—

 
—

 
$
80.5
Reconciliation Of Assets And Liabilities Measured At Fair Value On Recurring Basis, Level 3
The following tables provide a reconciliation between the beginning and ending balances of items measured at fair value on a recurring basis using significant unobservable inputs for the periods indicated (in millions).
 
Auction Rate Securities

Assets
Student
Loan
 
Structured
Finance
Securities
 
Total
Balances as of December 31, 2010
$
16.4

 
$
2.6

 
$
19.0

Redemption or sale of securities, cost basis
(4.6
)
 
—

 
(4.6
)
Reversal of unrealized losses on redeemed or sold securities
0.5

 
—

 
0.5

Changes in fair value recorded in earnings
—

 
(0.6
)
 
(0.6
)
Changes in unrealized (losses) gains included in other comprehensive income
(0.4
)
 
(0.3
)
 
(0.7
)
Balances as of December 31, 2011
$
11.9

 
$
1.7

 
$
13.6

Changes in fair value recorded in earnings
—

 
—

 
—

Changes in unrealized (losses) gains included in other comprehensive income
(0.2
)
 
1.0

 
0.8

Balances as of December 31, 2012
$
11.7

 
$
2.7

 
$
14.4

 
 
 
 
 
 
Liabilities
Acquisition-Related
Contingent Consideration
 
 
 
 
Balance as of December 31, 2010
$
45.0

 
 
 
 
Additions from new business combinations
47.7

 
 
 
 
Payments of contingent consideration
(12.2
)
 
 
 
 
Balance as of December 31, 2011
$
80.5

 
 
 
 
Additions from new business combinations
66.7

 
 
 
 
Payments of contingent consideration
(3.6
)
 
 
 
 
Valuation gains/losses recorded in earnings
—

 
 
 
 
Balance as of December 31, 2012
$
143.6