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Financing Agreements (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt presented on our consolidated balance sheets as of December 31, 2014 and 2013 consisted of the following:
 
December 31,
 
2014
 
2013
 
(in millions)
Unsecured senior notes:
 

 
 

6.875% due 2018
$
800.0

 
$
800.0

7.125% due 2020
800.0

 
800.0

3.450% due 2023
749.4

 
749.3

5.150% due 2034
746.2

 
—

4.950% due 2043
748.8

 
748.8

5.375% due 2044
748.1

 
—

 
4,592.5

 
3,098.1

Less: Current portion
—

 
—

Net long-term debt
$
4,592.5

 
$
3,098.1