Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Schedule Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis

The following fair value hierarchy table categorizes information regarding our net financial assets measured at fair value on a recurring basis (in millions):



	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total
As of September 30, 2015
Supplemental executive retirement plan assets	$	42.8	$	—		$	—	$	42.8
Total financial assets	42.8		—			—		42.8
Derivatives, net	—		(32.7		)	—		(32.7		)
Total financial liabilities	$	—	$	(32.7	)	$	—	$	(32.7	)

As of December 31, 2014
Supplemental executive retirement plan assets	$	43.2	$	—		$	—	$	43.2
Total financial assets	43.2		—			—		43.2
Derivatives, net	—		(26.3		)	—		(26.3		)
Total financial liabilities	$	—	$	(26.3	)	$	—	$	(26.3	)

Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments

The carrying values and estimated fair values of our long-term debt instruments were as follows (in millions):



	September 30, 2015				December 31, 2014
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
4.70% Senior notes due 2021	$	1,482.0	$	1,254.7	$	1,479.9	$	1,505.3
5.75% Senior notes due 2044	1,004.0		706.9		622.3		615.8
6.875% Senior notes due 2020	995.4		886.5		1,008.2		1,008.5
5.20% Senior notes due 2025	697.5		572.3		—		—
4.50% Senior notes due 2024	624.2		487.5		624.2		602.0
8.50% Senior notes due 2019	570.8		517.5		583.8		611.8
7.875% Senior notes due 2040	380.2		253.0		381.2		363.8
7.20% Debentures due 2027	149.2		136.7		149.2		171.4
4.33% MARAD bonds, including current maturities, due 2016	—		—		46.6		46.8
4.65% MARAD bonds, including current maturities, due 2020	—		—		27.0		29.7
3.25% Senior notes due 2016	—		—		998.0		1,018.3
Total	$	5,903.3	$	4,815.1	$	5,920.4	$	5,973.4