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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION, Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Operating activities        
Cash provided by operating activities     $ 967,951 $ 1,002,970
Investing activities        
Capital expenditures $ (830,459) $ (350,885) (1,720,164) (615,352)
Contributions to unconsolidated affiliates     (1,369) (294)
Cash used in investing activities     (1,632,061) (601,401)
Financing activities        
Dividends paid     (711,534) (643,493)
Distributions to noncontrolling interests     0 (3,000)
Borrowing (repayment) of short-term borrowings, net     0 (458,673)
Issuance of long-term debt, net of discounts     2,192,782 0
Payments of Financing Costs     11,914 0
Repayment of long-term debt     (503,825) (503,825)
Issuance of common stock     14,158 1,186,718
Other, net     (54,135) (1,194)
Cash provided by financing activities     925,532 (423,467)
Change in cash and cash equivalents     261,422 (21,898)
Cash and cash equivalents at beginning of period     11,975 37,193
Cash and cash equivalents at end of period 273,397 15,295 273,397 15,295
Reportable Legal Entities | Parent Issuer & Guarantor        
Operating activities        
Cash provided by operating activities     536,000 669,200
Investing activities        
Capital expenditures     (10,300) (10,100)
Contributions to unconsolidated affiliates     0 0
Other investing activities     0 0
Cash used in investing activities     (10,300) (10,100)
Financing activities        
Dividends paid     (711,500) (643,500)
Distributions to noncontrolling interests       0
Intercompany borrowings (advances), net     (1,694,500) (748,000)
Borrowing (repayment) of short-term borrowings, net       (458,700)
Issuance of long-term debt, net of discounts     2,192,800  
Repayment of long-term debt     0 0
Issuance of common stock     14,100 1,186,700
Other, net     (65,200) (17,500)
Cash provided by financing activities     (264,300) (681,000)
Change in cash and cash equivalents     261,400 (21,900)
Cash and cash equivalents at beginning of period     12,000 37,200
Cash and cash equivalents at end of period 273,400 15,300 273,400 15,300
Reportable Legal Entities | Subsidiary Issuer & Guarantor        
Operating activities        
Cash provided by operating activities     660,600 673,900
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0 0
Other investing activities     0 0
Cash used in investing activities     0 0
Financing activities        
Dividends paid     (666,000) (666,000)
Distributions to noncontrolling interests       0
Intercompany borrowings (advances), net     505,400 492,100
Borrowing (repayment) of short-term borrowings, net       0
Issuance of long-term debt, net of discounts     0  
Repayment of long-term debt     (500,000) (500,000)
Issuance of common stock     0 0
Other, net     0 0
Cash provided by financing activities     (660,600) (673,900)
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     34,500 32,400
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0 0
Other investing activities     68,200 6,400
Cash used in investing activities     68,200 6,400
Financing activities        
Dividends paid     (666,000) (666,000)
Distributions to noncontrolling interests       0
Intercompany borrowings (advances), net     563,300 627,200
Borrowing (repayment) of short-term borrowings, net       0
Issuance of long-term debt, net of discounts     0  
Repayment of long-term debt     0 0
Issuance of common stock     0 0
Other, net     0 0
Cash provided by financing activities     (102,700) (38,800)
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 | Combined Non-Guarantor Subsidiaries        
Operating activities        
Cash provided by operating activities     1,068,900 959,500
Investing activities        
Capital expenditures     (1,709,900) (605,300)
Contributions to unconsolidated affiliates     (1,400) (300)
Other investing activities     21,300 7,900
Cash used in investing activities     (1,690,000) (597,700)
Financing activities        
Dividends paid     0 0
Distributions to noncontrolling interests       (3,000)
Intercompany borrowings (advances), net     625,800 (371,300)
Borrowing (repayment) of short-term borrowings, net       0
Issuance of long-term debt, net of discounts     0  
Repayment of long-term debt     (3,800) (3,800)
Issuance of common stock     0 0
Other, net     (900) 16,300
Cash provided by financing activities     621,100 (361,800)
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     968,000 1,003,000
Investing activities        
Capital expenditures     (1,720,200) (615,400)
Contributions to unconsolidated affiliates     (1,400) (300)
Other investing activities     89,500 14,300
Cash used in investing activities     (1,632,100) (601,400)
Financing activities        
Dividends paid     (711,500) (643,500)
Distributions to noncontrolling interests       (3,000)
Intercompany borrowings (advances), net     0 0
Borrowing (repayment) of short-term borrowings, net       (458,700)
Issuance of long-term debt, net of discounts     2,192,800  
Repayment of long-term debt     (503,800) (503,800)
Issuance of common stock     14,100 1,186,700
Other, net     (66,100) (1,200)
Cash provided by financing activities     925,500 (423,500)
Change in cash and cash equivalents     261,400 (21,900)
Cash and cash equivalents at beginning of period     12,000 37,200
Cash and cash equivalents at end of period 273,400 15,300 273,400 15,300
Consolidating Entries        
Operating activities        
Cash provided by operating activities     (1,332,000) (1,332,000)
Investing activities        
Capital expenditures     0 0
Contributions to unconsolidated affiliates     0 0
Other investing activities     0 0
Cash used in investing activities     0 0
Financing activities        
Dividends paid     1,332,000 1,332,000
Distributions to noncontrolling interests       0
Intercompany borrowings (advances), net     0 0
Borrowing (repayment) of short-term borrowings, net       0
Issuance of long-term debt, net of discounts     0  
Repayment of long-term debt     0 0
Issuance of common stock     0 0
Other, net     0 0
Cash provided by financing activities     1,332,000 1,332,000
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