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SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION - Condensed Consolidating Statements of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities $ 138.8 $ 122.8 $ 94.8
Cash flows from investing activities:      
Purchases of property, plant and equipment (42.7) (39.9) (42.7)
Payments for acquisitions, net of cash acquired 0.0 (72.3) (295.1)
Proceeds from sale of businesses and property, plant and equipment 2.9 20.7 3.5
Purchase of environmental credits 0.0 (2.8) 0.0
Insurance proceeds from property loss claims 6.0 2.6  
Investment in subsidiaries 0.0 0.0 0.0
Net cash used in investing activities (33.8) (91.7) (334.3)
Cash flows from financing activities:      
Proceeds from revolver borrowings 353.5 431.2 54.4
Repayments of revolver borrowings (368.5) (425.2) (45.4)
Proceeds from issuance of debt 0.0 0.0 211.5
Proceeds from warrant and stock option exercises 0.2 0.1 2.7
Payments of other long-term obligations (33.4) (5.9) (9.0)
Payments for finance leases, promissory notes and other (32.8) (29.6) (20.3)
Debt issuance costs 0.0 0.0 (4.5)
Payments for Share Repurchase Program 0.0 (6.7) 0.0
Shares redeemed for employee income tax obligations (3.2) (1.9) (3.1)
Other proceeds 0.0 4.6 0.0
Intercompany funding 0.0 0.0 0.0
Net cash provided by (used in) financing activities (84.2) (33.4) 186.3
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS (0.2) (0.3)  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 20.6 (2.6) (53.2)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 20.0 22.6 75.8
CASH AND CASH EQUIVALENTS AT END OF PERIOD 40.6 20.0 22.6
Eliminations and Reclassifications      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 18.0 (3.1) 15.3
Cash flows from investing activities:      
Purchases of property, plant and equipment 0.0 0.0 0.0
Payments for acquisitions, net of cash acquired   0.0 0.0
Proceeds from sale of businesses and property, plant and equipment 0.0 0.0 0.0
Purchase of environmental credits   0.0  
Insurance proceeds from property loss claims 0.0 0.0  
Investment in subsidiaries (1.0) (6.5) 1.8
Net cash used in investing activities (1.0) (6.5) 1.8
Cash flows from financing activities:      
Proceeds from revolver borrowings 0.0 0.0 0.0
Repayments of revolver borrowings 0.0 0.0 0.0
Proceeds from warrant and stock option exercises 0.0 0.0 0.0
Payments of other long-term obligations 0.0 0.0 0.0
Payments for finance leases, promissory notes and other 0.0 0.0 0.0
Debt issuance costs     0.0
Payments for Share Repurchase Program   0.0  
Shares redeemed for employee income tax obligations 0.0 0.0 0.0
Other proceeds   0.0  
Intercompany funding (17.0) 9.6 (17.1)
Net cash provided by (used in) financing activities (17.0) 9.6 (17.1)
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS 0.0 0.0  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0.0 0.0  
CASH AND CASH EQUIVALENTS AT END OF PERIOD 0.0 0.0 0.0
Parent | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (42.3) (32.5) (30.1)
Cash flows from investing activities:      
Purchases of property, plant and equipment 0.0 0.0 0.0
Payments for acquisitions, net of cash acquired   0.0 (236.1)
Proceeds from sale of businesses and property, plant and equipment 0.0 0.0 0.0
Purchase of environmental credits   0.0  
Insurance proceeds from property loss claims 0.0 0.0  
Investment in subsidiaries 1.0 6.5 (1.8)
Net cash used in investing activities 1.0 6.5 (237.9)
Cash flows from financing activities:      
Proceeds from revolver borrowings 353.5 431.2 54.4
Repayments of revolver borrowings (368.5) (425.2) (45.4)
Proceeds from issuance of debt     211.5
Proceeds from warrant and stock option exercises 0.2 0.1 2.7
Payments of other long-term obligations (0.7) (2.2) (4.2)
Payments for finance leases, promissory notes and other (0.3) 0.0 0.0
Debt issuance costs     (4.5)
Payments for Share Repurchase Program   (6.7)  
Shares redeemed for employee income tax obligations (3.2) (1.9) (3.1)
Other proceeds   0.0  
Intercompany funding 60.3 30.7 56.6
Net cash provided by (used in) financing activities 41.3 26.0 268.0
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS 0.0 0.0  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS AT END OF PERIOD 0.0 0.0 0.0
Guarantor Subsidiaries | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 147.2 156.5 114.5
Cash flows from investing activities:      
Purchases of property, plant and equipment (39.1) (35.9) (40.0)
Payments for acquisitions, net of cash acquired   (72.3) (59.0)
Proceeds from sale of businesses and property, plant and equipment 2.9 20.7 3.5
Purchase of environmental credits   0.0  
Insurance proceeds from property loss claims 5.3 1.6  
Investment in subsidiaries 0.0 0.0 0.0
Net cash used in investing activities (30.9) (85.9) (95.5)
Cash flows from financing activities:      
Proceeds from revolver borrowings 0.0 0.0 0.0
Repayments of revolver borrowings 0.0 0.0 0.0
Proceeds from warrant and stock option exercises 0.0 0.0 0.0
Payments of other long-term obligations (32.7) (3.7) (4.8)
Payments for finance leases, promissory notes and other (31.8) (28.5) (20.2)
Debt issuance costs     0.0
Payments for Share Repurchase Program   0.0  
Shares redeemed for employee income tax obligations 0.0 0.0 0.0
Other proceeds   4.6  
Intercompany funding (33.6) (39.2) (62.6)
Net cash provided by (used in) financing activities (98.1) (66.8) (87.6)
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS 0.0 0.0  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 18.2 3.8 (68.6)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 10.8 7.0 75.6
CASH AND CASH EQUIVALENTS AT END OF PERIOD 29.0 10.8 7.0
Non-Guarantor Subsidiaries | Reportable Legal Entities      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities 15.9 1.9 (4.9)
Cash flows from investing activities:      
Purchases of property, plant and equipment (3.6) (4.0) (2.7)
Payments for acquisitions, net of cash acquired   0.0 0.0
Proceeds from sale of businesses and property, plant and equipment 0.0 0.0 0.0
Purchase of environmental credits   (2.8)  
Insurance proceeds from property loss claims 0.7 1.0  
Investment in subsidiaries 0.0 0.0 0.0
Net cash used in investing activities (2.9) (5.8) (2.7)
Cash flows from financing activities:      
Proceeds from revolver borrowings 0.0 0.0 0.0
Repayments of revolver borrowings 0.0 0.0 0.0
Proceeds from warrant and stock option exercises 0.0 0.0 0.0
Payments of other long-term obligations 0.0 0.0 0.0
Payments for finance leases, promissory notes and other (0.7) (1.1) (0.1)
Debt issuance costs     0.0
Payments for Share Repurchase Program   0.0  
Shares redeemed for employee income tax obligations 0.0 0.0 0.0
Other proceeds   0.0  
Intercompany funding (9.7) (1.1) 23.1
Net cash provided by (used in) financing activities (10.4) (2.2) 23.0
EFFECT OF EXCHANGE RATES ON CASH AND CASH EQUIVALENTS (0.2) (0.3)  
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 2.4 (6.4) 15.4
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 9.2 15.6 0.2
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 11.6 $ 9.2 $ 15.6