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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 28, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,036,705,000	$ 3,121,558,000
Parent
Debt Instrument [Line Items]
Subsidiaries, Ownership Percentage			100.00%
Long-term Debt, Gross	$ 3,036,705,000	$ 3,121,558,000
Parent | Senior Notes | 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%	6.875%
Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Parent | Senior Notes | 6.000% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 750,000,000	$ 750,000,000
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 750,000,000	750,000,000
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross		750,000,000
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross		750,000,000
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.000% Senior Notes Due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 700.0

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+ 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))
-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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

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

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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

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