Debt (Tables)

3 Months Ended

Mar. 31, 2013

Debt

Carrying values of the senior notes

	March 31, 2013		December 31, 2012
2.450% senior notes due 2015	$	518.4	$	520.1
1.900% senior notes due 2017	501.1		500.6
3.950% senior notes due 2020	501.5		499.0
3.250% senior notes due 2022	993.6		1,002.1
5.700% senior notes due 2040	249.5		249.5
Total long-term debt	$	2,764.1	$	2,771.3