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Debt (Tables)
9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Carrying values of the senior notes
Summarized below are the carrying values of our senior notes at September 30, 2013 and December 31, 2012:
 
 
September 30, 2013
 
December 31, 2012
2.450% senior notes due 2015
$
515.7

 
$
520.1

1.900% senior notes due 2017
500.8

 
500.6

2.300% senior notes due 2018
400.1

 

3.950% senior notes due 2020
492.4

 
499.0

3.250% senior notes due 2022
975.0

 
1,002.1

4.000% senior notes due 2023
698.1

 

5.700% senior notes due 2040
249.6

 
249.5

5.250% senior notes due 2043
396.6

 

Total long-term debt
$
4,228.3

 
$
2,771.3