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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating activities        
Cash provided by operating activities     $ 1,002,970 $ 642,891
Investing activities        
Capital expenditures $ (350,885) $ (82,495) (615,352) (195,232)
Contributions to unconsolidated affiliates     (294) (4,653)
Cash provided by (used in) investing activities     (601,401) (183,731)
Financing activities        
Dividends paid     (643,493) (259,758)
Distributions to noncontrolling interests     (3,000) (273,460)
Borrowing (repayment) of short-term borrowings, net     (458,673) 164,130
Repayment of long-term debt     (503,825) (3,898)
Issuance of common stock     1,186,718 10,845
Other, net     (1,194) (13,523)
Cash used in financing activities     (423,467) (375,664)
Change in cash and cash equivalents     (21,898) 83,496
Cash and cash equivalents at beginning of period     37,193 248,875
Cash and cash equivalents at end of period 15,295 332,371 15,295 332,371
Reportable Legal Entities | Parent Issuer & Guarantor        
Operating activities        
Cash provided by operating activities     669,200 355,000
Investing activities        
Capital expenditures     (10,100) (100)
Contributions to unconsolidated affiliates     0  
Other investing activities     0 0
Cash provided by (used in) investing activities     (10,100) (100)
Financing activities        
Dividends paid     (643,500) (259,800)
Distributions to noncontrolling interests     0 0
Intercompany borrowings (advances), net     (748,000) (27,100)
Borrowing (repayment) of short-term borrowings, net     (458,700) 0
Repayment of long-term debt     0 (100)
Issuance of common stock     1,186,700 10,800
Other, net     (17,500) (6,200)
Cash used in financing activities     (681,000) (282,400)
Change in cash and cash equivalents     (21,900) 72,500
Cash and cash equivalents at beginning of period     37,200 248,500
Cash and cash equivalents at end of period 15,300 321,000 15,300 321,000
Reportable Legal Entities | Subsidiary Issuer & Guarantor        
Operating activities        
Cash provided by operating activities     673,900 675,200
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0  
Other investing activities     0 0
Cash provided by (used in) investing activities     0 0
Financing activities        
Dividends paid     (666,000) (666,000)
Distributions to noncontrolling interests     0 0
Intercompany borrowings (advances), net     492,100 (166,100)
Borrowing (repayment) of short-term borrowings, net     0 164,100
Repayment of long-term debt     (500,000) 0
Issuance of common stock     0 0
Other, net     0 (7,200)
Cash used in financing activities     (673,900) (675,200)
Change in cash and cash equivalents     0 0
Cash and cash equivalents at beginning of period     0 0
Cash and cash equivalents at end of period 0 0 0 0
Reportable Legal Entities | Guarantor Subsidiary        
Operating activities        
Cash provided by operating activities     32,400 28,200
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0  
Other investing activities     6,400 6,700
Cash provided by (used in) investing activities     6,400 6,700
Financing activities        
Dividends paid     (666,000) (666,000)
Distributions to noncontrolling interests     0 0
Intercompany borrowings (advances), net     627,200 642,100
Borrowing (repayment) of short-term borrowings, net     0 0
Repayment of long-term debt     0 0
Issuance of common stock     0 0
Other, net     0 0
Cash used in financing activities     (38,800) (23,900)
Change in cash and cash equivalents     0 11,000
Cash and cash equivalents at beginning of period     0 400
Cash and cash equivalents at end of period 0 11,400 0 11,400
Reportable Legal Entities | Combined Non-Guarantor Subsidiaries        
Operating activities        
Cash provided by operating activities     959,500 645,500
Investing activities        
Capital expenditures     (605,300) (195,100)
Contributions to unconsolidated affiliates     (300)  
Other investing activities     7,900 4,800
Cash provided by (used in) investing activities     (597,700) (190,300)
Financing activities        
Dividends paid     0 0
Distributions to noncontrolling interests     (3,000) (2,500)
Intercompany borrowings (advances), net     (371,300) (448,900)
Borrowing (repayment) of short-term borrowings, net     0 0
Repayment of long-term debt     (3,800) (3,800)
Issuance of common stock     0 0
Other, net     16,300 0
Cash used in financing activities     (361,800) (455,200)
Change in cash and cash equivalents     0 0
Cash and cash equivalents at beginning of period     0 0
Cash and cash equivalents at end of period 0 0 0 0
Reportable Legal Entities | Total        
Operating activities        
Cash provided by operating activities     1,003,000 642,900
Investing activities        
Capital expenditures     (615,400) (195,200)
Contributions to unconsolidated affiliates     (300)  
Other investing activities     14,300 11,500
Cash provided by (used in) investing activities     (601,400) (183,700)
Financing activities        
Dividends paid     (643,500) (259,800)
Distributions to noncontrolling interests     (3,000) (273,500)
Intercompany borrowings (advances), net     0 0
Borrowing (repayment) of short-term borrowings, net     (458,700) 164,100
Repayment of long-term debt     (503,800) (3,900)
Issuance of common stock     1,186,700 10,800
Other, net     (1,200) (13,400)
Cash used in financing activities     (423,500) (375,700)
Change in cash and cash equivalents     (21,900) 83,500
Cash and cash equivalents at beginning of period     37,200 248,900
Cash and cash equivalents at end of period 15,300 332,400 15,300 332,400
Consolidating Entries        
Operating activities        
Cash provided by operating activities     (1,332,000) (1,061,000)
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0  
Other investing activities     0 0
Cash provided by (used in) investing activities     0 0
Financing activities        
Dividends paid     1,332,000 1,332,000
Distributions to noncontrolling interests     0 (271,000)
Intercompany borrowings (advances), net     0 0
Borrowing (repayment) of short-term borrowings, net     0 0
Repayment of long-term debt     0 0
Issuance of common stock     0 0
Other, net     0 0
Cash used in financing activities     1,332,000 1,061,000
Change in cash and cash equivalents     0 0
Cash and cash equivalents at beginning of period     0 0
Cash and cash equivalents at end of period $ 0 $ 0 $ 0 $ 0