XML 106 R59.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2017	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2019	Dec. 31, 2015	Dec. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Current maturities of long-term debt				$ 124.8		$ 0.0
Long-term Debt, Excluding Current Maturities				$ 5,923.5		5,010.4
6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				6.875%
Senior Note Maturity Year				2020
6.875% Senior notes due 2020 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			6.875%
Senior Note Maturity Year		2020	2020
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.70%
Senior Note Maturity Year				2021
4.70% Senior notes due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.70%
Senior Note Maturity Year		2021	2021
4.875%SeniorNotesDue2022Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.875%
Senior Note Maturity Year				2022
4.875%SeniorNotesDue2022Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.875%
3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.00%
Senior Note Maturity Year				2024
3.00% Exchangeable senior notes due 2024(2) | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.00%
Senior Note Maturity Year				2024
Carrying value of 2024 convertible notes				$ 838.3		$ 836.3
4.50% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.50%
Senior Note Maturity Year				2024
4.50% Senior notes due 2024(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.50%		4.50%
Senior Note Maturity Year					2024
4.75%SeniorNotesDue2024Member [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.75%
Senior Note Maturity Year				2024
4.75%SeniorNotesDue2024Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.75%
8.00% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.00%
Senior Note Maturity Year				2024
8.00% Senior notes due 2024(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			8.00%	8.00%		8.00%
Senior Note Maturity Year				2024
5.20% Senior notes due 2025(1)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.20%
Senior Note Maturity Year				2025
5.20% Senior notes due 2025(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.20%	5.20%
Senior Note Maturity Year				2025
7.38%SeniorNotesDue2025 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.375%
Senior Note Maturity Year				2025
7.38%SeniorNotesDue2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.375%
7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.75%
Senior Note Maturity Year				2026
7.75% Senior notes due 2026 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage							7.75%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.20%
Senior Note Maturity Year				2027
7.20% Senior notes due 2027 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.20%			7.20%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				7.875%
Senior Note Maturity Year				2040
7.875% Senior notes due 2040 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.875%
Senior Note Maturity Year			2040
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.40%
Senior Note Maturity Year				2042
5.40%SeniorNotesDue2042 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.40%
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.75%
Senior Note Maturity Year				2044
5.75% Senior notes due 2044 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					5.75%			5.75%
Senior Note Maturity Year	2044				2044
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.85%
Senior Note Maturity Year				2044
5.85%SeniorNotesDue2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.85%
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 6,048.3		$ 5,010.4
Long-term Debt, Excluding Current Maturities				5,923.5		5,010.4
Reported Value Measurement [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				124.8		127.5
Reported Value Measurement [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				113.2		112.7
Reported Value Measurement [Member] | 4.875%SeniorNotesDue2022Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				599.2		0.0
Reported Value Measurement [Member] | 3.00% Exchangeable senior notes due 2024(2) | Convertible Debt [Member]
Debt Instrument [Line Items]
Long-term Debt				699.0		666.8
Reported Value Measurement [Member] | 4.50% Senior notes due 2024(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				302.0		619.8
Reported Value Measurement [Member] | 4.75%SeniorNotesDue2024Member [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				276.5		0.0
Reported Value Measurement [Member] | 8.00% Senior notes due 2024(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				295.7		337.0
Reported Value Measurement [Member] | 5.20% Senior notes due 2025(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				331.7		664.4
Reported Value Measurement [Member] | 7.38%SeniorNotesDue2025 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				329.2		0.0
Reported Value Measurement [Member] | 7.75% Senior notes due 2026 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				987.1		985.0
Reported Value Measurement [Member] | 7.20% Senior notes due 2027 | Debentures Due 2027
Debt Instrument [Line Items]
Long-term Debt				111.7		149.3
Reported Value Measurement [Member] | 7.875% Senior notes due 2040 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				373.3		375.0
Reported Value Measurement [Member] | 5.40%SeniorNotesDue2042 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				262.8		0.0
Reported Value Measurement [Member] | 5.75% Senior notes due 2044 | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				973.3		972.9
Reported Value Measurement [Member] | 5.85%SeniorNotesDue2044 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 268.8		$ 0.0

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

3.00% exchangeable senior notes, excluding discount and net of debt issuance costs

+ References

No definition available.

+ Details

Name:	val_A3.00exchangeableseniornotesexcludingdiscountandnetofdebtissuancecosts
Namespace Prefix:	val_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Senior Note Maturity Year

+ References

No definition available.

+ Details

Name:	val_SeniorNoteMaturityYear
Namespace Prefix:	val_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_FourPointSevenZeroPercentSeniorNotesDueTwoThousandTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A4.875SeniorNotesDue2022MemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_ThreePercentExchangeableSeniorNotesDueTwoThousandTwentyFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_FourPointFivePercentSeniorNotesMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A4.75SeniorNotesDue2024MemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A8.00seniornotesdue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_FivePointTwoPercentSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A7.38SeniorNotesDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_SevenPointSevenFivePercentSeniorNotesDueTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_SevenPointEightSevenFivePercentSeniorNotesDueTwoThousandFortyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A5.40SeniorNotesDue2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_FivePointSevenFivePercentSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=val_A5.85SeniorNotesDue2044Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=val_DebenturesDue2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: