Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

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 March 31, 2017
Supplemental executive retirement plan assets	$	28.5	$	—		$	—	$	28.5
Total financial assets	$	28.5	$	—		$	—	$	28.5
Derivatives, net	$	—	$	(1.6	)	$	—	$	(1.6	)
Total financial liabilities	$	—	$	(1.6	)	$	—	$	(1.6	)

As of December 31, 2016
Supplemental executive retirement plan assets	$	27.7	$	—		$	—	$	27.7
Total financial assets	$	27.7	$	—		$	—	$	27.7
Derivatives, net	$	—	$	(8.8	)	$	—	$	(8.8	)
Total financial liabilities	$	—	$	(8.8	)	$	—	$	(8.8	)

Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments

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



	March 31, 2017				December 31, 2016
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
8.50% Senior notes due 2019	$	317.6	$	319.5	$	480.2	$	485.0
6.875% Senior notes due 2020	592.8		577.0		735.9		727.5
4.70% Senior notes due 2021	301.1		298.0		674.4		658.9
3.00% Exchangeable senior notes due 2024⁽¹⁾	613.5		834.6		604.3		874.7
4.50% Senior notes due 2024	618.7		530.1		618.6		536.0
8.00% Senior notes due 2024	338.7		335.7		—		—
5.20% Senior notes due 2025	663.0		583.6		662.8		582.3
7.20% Debentures due 2027	149.2		147.6		149.2		138.7
7.875% Senior notes due 2040	377.9		278.2		378.3		270.6
5.75% Senior notes due 2044	971.0		761.4		970.8		728.0
Total	$	4,943.5	$	4,665.7	$	5,274.5	$	5,001.7