Debt (Tables)
3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Schedule of short-term debt
The carrying value of short-term borrowings and current portion of long-term debt outstanding at March 31, 2015 and December 31, 2014 includes:
 
 
March 31, 2015
 
December 31, 2014
Commercial paper
 
$
—

 
$
99.6

2.450% senior notes due 2015
 
504.4

 
506.3

Total
 
$
504.4

 
$
605.9

Carrying values of the senior notes
Summarized below are the carrying values of our senior notes at March 31, 2015 and December 31, 2014:
 
 
March 31, 2015
 
December 31, 2014
1.900% senior notes due 2017
$
502.4

 
$
501.0

2.300% senior notes due 2018
402.9

 
401.2

2.250% senior notes due 2019
507.8

 
502.5

3.950% senior notes due 2020
510.4

 
502.8

3.250% senior notes due 2022
1,024.9

 
1,010.2

4.000% senior notes due 2023
715.0

 
708.5

3.625% senior notes due 2024
996.8

 
996.8

5.700% senior notes due 2040
249.6

 
249.5

5.250% senior notes due 2043
396.7

 
396.7

4.625% senior notes due 2044
996.5

 
996.5

Total long-term debt
$
6,303.0

 
$
6,265.7