Debt and Financing (Tables)

6 Months Ended

Jun. 30, 2016

Debt Instruments [Abstract]

Long-term debt

The following table summarizes the Company's long-term debt (in millions, except percentages):

	As of June 30, 2016
	Amount			Effective Interest Rates
Senior Notes:
3.125% fixed-rate notes, due February 2019	$	350.0		3.36	%
3.300% fixed-rate notes, due June 2020	300.0			3.47	%
4.600% fixed-rate notes, due March 2021	300.0			4.69	%
4.500% fixed-rate notes, due March 2024, issued March 2014	350.0			4.63	%
4.500% fixed-rate notes, due March 2024, issued February 2016	150.0			4.87	%
4.350% fixed-rate notes, due June 2025	300.0			4.47	%
5.950% fixed-rate notes, due March 2041	400.0			6.03	%
Total senior notes	2,150.0
Unaccreted discount and debt issuance costs	(17.5		)
Total	$	2,132.5