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SUPPLEMENTARY GUARANTOR INFORMATION (Supplementary Statements of Condensed Consolidating Cash Flows) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net cash provided (used) by operating activities |  | $ 338.1 | $ 303.0 | $ 37.9
INVESTING ACTIVITIES |  |  |  |
Purchase of property, plant and equipment |  | 151.7 | 69.1 | 80.8
Intercompany investing |  | 0.0 | 0.0 | 0.0
Other investing activities |  | (4.3) | 11.2 | (22.4)
Net cash provided (used) by investing activities |  | 156.0 | 57.9 | 103.2
FINANCING ACTIVITIES |  |  |  |
Net proceeds from issuance of common shares | $ 287.6 | 661.3 | 287.4 | 0.0
Proceeds from issuance of debt |  | 1,771.5 | 0.0 | 503.5
Debt issuance costs |  | (28.6) | (5.2) | (33.6)
Borrowings under credit facilities |  | 0.0 | 105.0 | 309.8
Repayment under credit facilities |  | 0.0 | (105.0) | (309.8)
Repayments on equipment loans |  | 0.0 | (95.6) | (45.4)
Repurchase of debt |  | (1,720.7) | (305.4) | (225.9)
Acquisition of noncontrolling interest |  | (105.0) | 0.0 | 0.0
Distributions of partnership equity |  | (52.9) | (59.9) | (40.6)
Preferred stock dividends |  | 0.0 | 0.0 | (51.2)
Intercompany financing |  | 0.0 | 0.0 | 0.0
Other financing activities |  | (26.7) | (27.7) | (45.8)
Net cash provided (used) by financing activities |  | 498.9 | (206.4) | 61.0
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 3.3 | (0.5) | (1.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | 684.3 | 38.2 | (5.7)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 285.2 | 323.4 | 285.2 | 290.9
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 1,007.7 | 323.4 | 285.2
Consolidation, Eliminations [Member] |  |  |  |
Net cash provided (used) by operating activities |  | 0.0 | 0.0 | 0.0
INVESTING ACTIVITIES |  |  |  |
Purchase of property, plant and equipment |  | 0.0 | 0.0 | 0.0
Intercompany investing |  | (173.3) | (236.3) | 288.7
Other investing activities |  | 0.0 | 0.0 | 0.0
Net cash provided (used) by investing activities |  | 173.3 | 236.3 | (288.7)
FINANCING ACTIVITIES |  |  |  |
Net proceeds from issuance of common shares |  | 0.0 | 0.0 |
Proceeds from issuance of debt |  | 0.0 |  | 0.0
Debt issuance costs |  | 0.0 | 0.0 | 0.0
Borrowings under credit facilities |  |  | 0.0 | 0.0
Repayment under credit facilities |  |  | 0.0 | 0.0
Repayments on equipment loans |  |  | 0.0 | 0.0
Repurchase of debt |  | 0.0 | 0.0 | 0.0
Acquisition of noncontrolling interest |  | 0.0 |  |
Distributions of partnership equity |  | 0.0 | 0.0 | 0.0
Preferred stock dividends |  |  |  | 0.0
Intercompany financing |  | 173.3 | 236.3 | (288.7)
Other financing activities |  | 0.0 | 0.0 | 0.0
Net cash provided (used) by financing activities |  | 173.3 | 236.3 | (288.7)
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 | 0.0 | 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | 0.0 | 0.0 | 0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 0.0 | 0.0 | 0.0 | 0.0
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 0.0 | 0.0 | 0.0
Parent [Member] | Reportable Legal Entities [Member] |  |  |  |
Net cash provided (used) by operating activities |  | (166.8) | (275.7) | 65.6
INVESTING ACTIVITIES |  |  |  |
Purchase of property, plant and equipment |  | 3.4 | 6.2 | 6.9
Intercompany investing |  | 225.7 | 356.6 | (205.8)
Other investing activities |  | (7.7) | 0.4 | 0.0
Net cash provided (used) by investing activities |  | (214.6) | (350.8) | 212.7
FINANCING ACTIVITIES |  |  |  |
Net proceeds from issuance of common shares |  | 661.3 | 287.4 |
Proceeds from issuance of debt |  | 1,771.5 |  | 503.5
Debt issuance costs |  | (28.6) | (5.2) | (33.6)
Borrowings under credit facilities |  |  | 105.0 | 296.8
Repayment under credit facilities |  |  | (105.0) | (296.8)
Repayments on equipment loans |  |  | (95.6) | (43.6)
Repurchase of debt |  | (1,720.7) | (305.4) | (225.9)
Acquisition of noncontrolling interest |  | (105.0) |  |
Distributions of partnership equity |  | 0.0 | 0.0 | 0.0
Preferred stock dividends |  |  |  | (51.2)
Intercompany financing |  | 45.0 | 117.0 | 80.0
Other financing activities |  | (5.8) | (0.6) | (5.0)
Net cash provided (used) by financing activities |  | 617.7 | (2.4) | 224.2
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 | 0.0 | 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | 665.5 | 72.7 | 77.1
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 210.7 | 283.4 | 210.7 | 133.6
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 948.9 | 283.4 | 210.7
Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Net cash provided (used) by operating activities |  | 430.4 | 462.9 | (23.7)
INVESTING ACTIVITIES |  |  |  |
Purchase of property, plant and equipment |  | 80.6 | 60.0 | 68.2
Intercompany investing |  | (7.4) | (3.3) | (2.9)
Other investing activities |  | 3.4 | 10.8 | (27.6)
Net cash provided (used) by investing activities |  | 84.6 | 52.5 | 98.7
FINANCING ACTIVITIES |  |  |  |
Net proceeds from issuance of common shares |  | 0.0 | 0.0 |
Proceeds from issuance of debt |  | 0.0 |  | 0.0
Debt issuance costs |  | 0.0 | 0.0 | 0.0
Borrowings under credit facilities |  |  | 0.0 | 0.0
Repayment under credit facilities |  |  | 0.0 | 0.0
Repayments on equipment loans |  |  | 0.0 | 0.0
Repurchase of debt |  | 0.0 | 0.0 | 0.0
Acquisition of noncontrolling interest |  | 0.0 |  |
Distributions of partnership equity |  | (52.9) | (59.9) | (40.6)
Preferred stock dividends |  |  |  | 0.0
Intercompany financing |  | (288.8) | (339.9) | 188.5
Other financing activities |  | (4.5) | (9.9) | (25.0)
Net cash provided (used) by financing activities |  | (346.2) | (409.7) | 122.9
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 0.0 | 0.0 | 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | (0.4) | 0.7 | 0.5
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 1.8 | 2.5 | 1.8 | 1.3
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | 2.1 | 2.5 | 1.8
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Net cash provided (used) by operating activities |  | 74.5 | 115.8 | (4.0)
INVESTING ACTIVITIES |  |  |  |
Purchase of property, plant and equipment |  | 67.7 | 2.9 | 5.7
Intercompany investing |  | (45.0) | (117.0) | (80.0)
Other investing activities |  | 0.0 | 0.0 | 5.2
Net cash provided (used) by investing activities |  | 112.7 | 119.9 | 80.5
FINANCING ACTIVITIES |  |  |  |
Net proceeds from issuance of common shares |  | 0.0 | 0.0 |
Proceeds from issuance of debt |  | 0.0 |  | 0.0
Debt issuance costs |  | 0.0 | 0.0 | 0.0
Borrowings under credit facilities |  |  | 0.0 | 13.0
Repayment under credit facilities |  |  | 0.0 | (13.0)
Repayments on equipment loans |  |  | 0.0 | (1.8)
Repurchase of debt |  | 0.0 | 0.0 | 0.0
Acquisition of noncontrolling interest |  | 0.0 |  |
Distributions of partnership equity |  | 0.0 | 0.0 | 0.0
Preferred stock dividends |  |  |  | 0.0
Intercompany financing |  | 70.5 | (13.4) | 20.2
Other financing activities |  | (16.4) | (17.2) | (15.8)
Net cash provided (used) by financing activities |  | 54.1 | (30.6) | 2.6
EFFECT OF EXCHANGE RATE CHANGES ON CASH |  | 3.3 | (0.5) | (1.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  | 19.2 | (35.2) | (83.3)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | $ 72.7 | 37.5 | 72.7 | 156.0
CASH AND CASH EQUIVALENTS AT END OF YEAR |  | $ 56.7 | $ 37.5 | $ 72.7

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