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CAPITAL STOCK - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 07, 2018 | Jan. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Authorized amount of stock available for repurchase |  |  | $ 1,500.0 |  | $ 1,500.0 |
Options exercised under incentive plans (in shares) |  |  |  | 0 |  |
Preferred Stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 | $ 0.01
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 |  | $ 25.00 |
Preferred Stock, shares issued (in shares) |  |  | 87,200,000 |  | 87,200,000 | 73,400,000
6.50% Series G Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  |  | 17,000,000 | 17,000,000.0 | 17,000,000 | 17,000,000
Preferred stock dividend rate, percentage |  |  |  | 6.50% | 6.50% |
Proceeds from issuance of redeemable preferred stock |  |  |  | $ 425.0 |  |
7.625% Series C Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  |  | 7,000,000 |  | 7,000,000 | 7,000,000
Preferred stock dividend rate, percentage |  |  |  | 7.625% | 7.625% |
Preferred stock redeemed (in shares) |  |  |  | 5,000,000.0 |  |
Redemption of preferred stock |  |  |  | $ 125.0 |  |
7.625% Series E Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividend rate, percentage |  |  |  | 7.625% |  |
Preferred stock redeemed (in shares) |  |  |  | 11,500,000 |  |
Redemption of preferred stock |  |  |  | $ 287.5 |  |
6.95% Series F Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  |  | 28,800,000 |  | 28,800,000 | 28,800,000
Preferred stock dividend rate, percentage |  |  |  |  | 6.95% |
8.125% Series H Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, redemption price (in dollars per share) |  |  | $ 25.00 |  | $ 25.00 |
Preferred Stock, shares issued (in shares) |  |  | 0 |  | 0 | 2,200,000
Preferred stock dividend rate, percentage |  |  | 8.125% |  | 8.125% |
Preferred stock redeemed (in shares) |  |  | 2,200,000 |  | 2,200,000 |
Redemption of preferred stock |  |  | $ 55.0 |  | $ 55.0 |
Series I Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, shares issued (in shares) |  |  | 16,000,000.0 |  | 16,000,000.0 | 0
Preferred stock dividend rate, percentage |  |  | 6.75% |  | 6.75% |
Proceeds from issuance of redeemable preferred stock |  |  | $ 400.0 |  | $ 400.0 |
Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  | 75,000,000.0 |
Proceeds from sale of stock |  |  |  |  | $ 730.5 |
Option to purchase additional shares, period |  |  |  |  | 30 days |
Public Offering, Additional Share Purchase Option [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  | 11,300,000 |
Proceeds from sale of stock |  |  |  |  | $ 109.6 |
At-the-market Sale Program |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  | 8,000,000.0 |  | 56,000,000.0 |
Proceeds from sale of stock |  |  | $ 80.1 |  | $ 569.1 |
Aggregate stock offering price |  | $ 1,500.0 |  |  |  |
Over-Allotment Option |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  | 2,400,000 |  | 2,400,000 |
Option to purchase additional shares, period |  |  |  |  | 30 days |
Mountain Merger Sub Corporation |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued as part of the consideration for asset acquisition (in shares) | 43,600,000 |  |  |  |  |
Mountain Merger Sub Corporation | 8.125% Series H Cumulative Redeemable Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred Stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |

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