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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

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 as of December 31, 2017 and 2016 (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 December 31, 2017
Supplemental executive retirement plan assets	$	30.9			$	—			$	—			$	30.9
Derivatives, net	—				6.8				—				6.8
Total financial assets	30.9				6.8				—				37.7
Total financial liabilities	—				—				—				—
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 as of December 31, 2017 and 2016 were as follows (in millions):

		December 31, 2017								December 31, 2016
		Carrying Value				Estimated   Fair Value				Carrying Value				Estimated   Fair Value
8.50% Senior notes due 2019		$	251.4			$	252.9			$	480.2			$	485.0
6.875% Senior notes due 2020		477.9				473.1				735.9				727.5
4.70% Senior notes due 2021		267.1				265.3				674.4				658.9
3.00% Exchangeable senior notes due 2024 (1)		635.7				757.1				604.3				874.7
4.50% Senior notes due 2024		619.3				527.1				618.6				536.0
8.00% Senior notes due 2024		337.9				333.8				—				—
5.20% Senior notes due 2025		663.6				571.4				662.8				582.3
7.20% Debentures due 2027		149.3				141.9				149.2				138.7
7.875% Senior notes due 2040		376.7				258.8				378.3				270.6
5.75% Senior notes due 2044		971.8				690.4				970.8				728.0
Total		$	4,750.7			$	4,271.8			$	5,274.5			$	5,001.7

⁽¹⁾   Our 2024 Convertible Notes were issued with a conversion feature. The 2024 Convertible Notes were separated into their liability and equity components on our consolidated balance sheet. The equity component was initially recorded to additional paid-in capital and as a debt discount, which will be amortized to interest expense. Excluding the unamortized discount, the carrying value of the 2024 Convertible Notes was $834.0 million and $830.1 million as of December 31, 2017 and 2016. See "Note 5 - Debt" for additional information on this issuance.

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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