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Condensed consolidating financial information - Cash Flows (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | $ (30.4) | $ 3.1
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (13.0) | (18.9)
Proceeds from sale of property, plant and equipment |  | 13.6
Intercompany transactions | 0.0 | 0.0
Net cash used in investing activities | (13.0) | (5.3)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities | 0.0 | 0.7
Repayments under revolving credit facilities | 0.0 | (0.7)
Issuance of common stock | 0.2 | 0.2
Intercompany transactions | 0.0 | 0.0
Net cash provided by financing activities | 0.2 | 0.2
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (43.2) | (2.0)
Cash, cash equivalents and restricted cash, beginning of period | 168.0 | 133.5
Cash, cash equivalents and restricted cash, end of period | 124.8 | 131.5
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 0.0 | 0.0
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | 0.0 | 0.0
Proceeds from sale of property, plant and equipment |  | 0.0
Intercompany transactions | (27.0) | 28.2
Net cash used in investing activities | (27.0) | 28.2
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities |  | 0.0
Repayments under revolving credit facilities |  | 0.0
Issuance of common stock | 0.0 | 0.0
Intercompany transactions | 27.0 | (28.2)
Net cash provided by financing activities | 27.0 | (28.2)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | 0.0 | 0.0
Cash, cash equivalents and restricted cash, beginning of period | 0.0 | 0.0
Cash, cash equivalents and restricted cash, end of period | 0.0 | 0.0
The Company [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (42.9) | (8.0)
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (4.2) | (7.8)
Proceeds from sale of property, plant and equipment |  | 0.0
Intercompany transactions | 17.2 | 11.8
Net cash used in investing activities | 13.0 | 4.0
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities |  | 0.7
Repayments under revolving credit facilities |  | (0.7)
Issuance of common stock | 0.2 | 0.2
Intercompany transactions | (7.3) | (3.6)
Net cash provided by financing activities | (7.1) | (3.4)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (37.0) | (7.4)
Cash, cash equivalents and restricted cash, beginning of period | 64.3 | 36.8
Cash, cash equivalents and restricted cash, end of period | 27.3 | 29.4
Combined Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | (2.9) | (25.9)
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (5.5) | (5.0)
Proceeds from sale of property, plant and equipment |  | 0.0
Intercompany transactions | 10.2 | (27.9)
Net cash used in investing activities | 4.7 | (32.9)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities |  | 0.0
Repayments under revolving credit facilities |  | 0.0
Issuance of common stock | 0.0 | 0.0
Intercompany transactions | (1.8) | 58.8
Net cash provided by financing activities | (1.8) | 58.8
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | 0.0 | 0.0
Cash, cash equivalents and restricted cash, beginning of period | 0.7 | 0.5
Cash, cash equivalents and restricted cash, end of period | 0.7 | 0.5
Combined Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net cash provided by (used in) operating activities | 15.4 | 37.0
Net cash provided by (used in) investing activities |  |
Purchase of property, plant and equipment | (3.3) | (6.1)
Proceeds from sale of property, plant and equipment |  | 13.6
Intercompany transactions | (0.4) | (12.1)
Net cash used in investing activities | (3.7) | (4.6)
Net cash provided by (used in) financing activities |  |
Borrowings under revolving credit facilities |  | 0.0
Repayments under revolving credit facilities |  | 0.0
Issuance of common stock | 0.0 | 0.0
Intercompany transactions | (17.9) | (27.0)
Net cash provided by financing activities | (17.9) | (27.0)
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (6.2) | 5.4
Cash, cash equivalents and restricted cash, beginning of period | 103.0 | 96.2
Cash, cash equivalents and restricted cash, end of period | $ 96.8 | $ 101.6

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