Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 835
-SubTopic 30
-Section 45
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

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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.

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No definition available.

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- 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/presentationRef
-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=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- 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

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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.

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Other Financial Statement Disclosures - Long Term Debt (Details) - USD ($)	Mar. 31, 2017	Jan. 09, 2017	Dec. 31, 2016	Apr. 30, 2016	Mar. 31, 2016
Debt Instrument [Line Items]
Total carrying value	$ 2,552,500,000		$ 2,680,200,000
Current portion of long-term debt	0		126,800,000
Carrying value, less current portion	2,552,500,000		2,553,400,000
Senior Notes [Member] \| 5% Senior Notes, due September 2017 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 0		$ 92,000,000
Stated rate	5.00%		5.00%		5.00%
Principal amount		$ 92,100,000.0	$ 92,200,000.0
Effective rate			5.20%
Senior Notes [Member] \| 7.875% Senior Notes, due August 2019 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 207,100,000		$ 208,900,000
Stated rate	7.875%			7.875%	7.875%
Principal amount	$ 207,900,000.0		$ 209,800,000.0
Effective rate	8.00%		8.00%
Senior Notes [Member] \| 4.875% Senior Notes, due June 2022 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 661,300,000		$ 695,400,000
Stated rate	4.875%
Principal amount	$ 656,600,000.0		$ 690,200,000.0
Effective rate	4.70%		4.70%
Senior Notes [Member] \| 4.75% Senior Notes, due January 2024 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 395,700,000		$ 395,600,000
Stated rate	4.75%
Principal amount	$ 398,100,000.0		$ 398,100,000.0
Effective rate	4.80%		4.80%
Senior Notes [Member] \| 7.375% Senior Note Payable Due June 2025 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 497,200,000		$ 497,200,000
Stated rate	7.375%
Principal amount	$ 500,000,000.0		$ 500,000,000.0
Effective rate	7.40%		7.40%
Senior Notes [Member] \| 5.4% Senior Notes due, December 2042 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 395,000,000		$ 394,900,000
Stated rate	5.40%
Principal amount	$ 400,000,000.0		$ 400,000,000
Effective rate	5.40%		5.40%
Senior Notes [Member] \| 5.85% Senior Notes, due January 2044 [Member]
Debt Instrument [Line Items]
Total carrying value	$ 396,200,000		$ 396,200,000
Stated rate	5.85%
Principal amount	$ 400,000,000		$ 400,000,000
Effective rate	5.90%		5.90%