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Condensed Parent Only Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CONDENSED STATEMENTS OF CASH FLOWS [Abstract] |  |  |  |
Net cash provided by operating activities |  | $ 1,744.5 | $ 1,389.8 | $ 1,144.0
Cash flows from investing activities |  |  |  |
Distributions from consolidated subsidiaries |  | 387.2 | 1,152.4 | 918.5
Net cash used in investing activities |  | (738.1) | (3,071.9) | (3,146.9)
Cash flows from financing activities |  |  |  |
Costs incurred in connection with financing arrangements |  | (9.9) | (35.5) | (24.7)
Partial repurchase of Series A Preferred Stock |  | (45.8) |  |
Net cash provided by (used in) financing activities |  | (1,094.7) | 1,781.1 | 2,097.8
Cash and cash equivalents, beginning of period |  | 331.1 | 232.1 | 137.2
Cash and cash equivalents, end of period |  | 242.8 | 331.1 | 232.1
Parent Company [Member] |  |  |  |
CONDENSED STATEMENTS OF CASH FLOWS [Abstract] |  |  |  |
Net cash provided by operating activities |  | (193.9) | 48.3 | 55.2
Cash flows from investing activities |  |  |  |
Advances to consolidated subsidiaries |  | 214.1 | (222.5) | (714.5)
Distributions from consolidated subsidiaries | [1] | 387.2 | 1,152.4 | 891.1
Net cash used in investing activities |  | 601.3 | 929.9 | 176.6
Cash flows from financing activities |  |  |  |
Proceeds from long-term debt borrowings |  | 155.0 | (450.0) | 365.0
Repayments of long-term debt |  | (35.0) | 450.0 | (365.0)
Costs incurred in connection with financing arrangements |  | 0.0 | 0.0 | (8.5)
Transaction costs incurred related to sale of ownership interests |  | 0.0 | (10.8) | 0.0
Proceeds from issuance of common stock, preferred stock and warrants |  | 0.0 | 0.0 | 689.0
Repurchase of common stock |  | (97.4) | (13.9) | (4.0)
Dividends paid to common and preferred shareholders |  | (384.2) | (953.5) | (908.3)
Partial repurchase of Series A Preferred Stock |  | (45.8) | 0.0 | 0.0
Net cash provided by (used in) financing activities |  | (407.4) | (978.2) | (231.8)
Net increase (decrease) in cash and cash equivalents |  | 0.0 | 0.0 | 0.0
Cash and cash equivalents, beginning of period |  | 0.0 | 0.0 | 0.0
Cash and cash equivalents, end of period |  | $ 0.0 | $ 0.0 | $ 0.0
[1] | Amounts reflect distributions from consolidated subsidiaries in excess of earnings. Total distributions from consolidated subsidiaries were $387.2 million, $1,152.4 million and $918.5 million for the years ended December 31, 2020, 2019 and 2018

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