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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]          
Net loss $ (63.7) $ (54.6) $ (10.5) $ (92.8) $ (104.7)
Loss (income) from discontinued operations 14.8 2.4 6.0 (12.5) (3.7)
Adjustments to reconcile net loss to net cash used in operating activities:          
Deferred income tax benefit (9.8) (4.4) (62.3) (8.3) (10.7)
Depreciation and amortization 42.4 39.7 53.8 53.2 52.2
Asset impairment       10.4 23.0
Amortization of debt issuance costs and debt discount 1.9 2.7 3.7 3.5 3.2
Loss on debt extinguishment 25.7        
Net periodic pension and postretirement cost 1.8 0.9 1.5 3.0 8.9
Share-based compensation 18.0 12.8 16.1 12.5 12.8
Environmental reserve       5.9  
Other 0.1 (2.0) (0.5) 1.2 0.4
Changes in operating assets and liabilities excluding effects of acquisitions and divestitures:          
Trade and other receivables 2.9 12.9 5.3 (5.8) (8.5)
Prepaid expenses and other current assets (3.0) (2.8) (6.9) 1.1 (5.6)
Accounts payable and other accrued expenses (8.4) (9.3) 0.1 (4.4) (4.5)
Deferred revenue 2.8 3.6 2.6 (1.8) (1.8)
Employee compensation and benefits (27.7) (33.4) (26.1) (49.1) (25.8)
Accrued interest (15.5) (17.5) (4.8) (0.2) 1.3
Accrued taxes 5.2 (10.3) (6.7) 14.7 4.5
Other assets and liabilities (2.3) 0.2 (0.7) (3.8) (3.9)
Net cash used in operating activities - continuing operations (14.8) (59.1) (29.4) (73.2) (62.9)
Net cash (used in) provided by operating activities - discontinued operations (3.3) (5.6) (10.4) (2.3) 44.6
Net cash used in operating activities (18.1) (64.7) (39.8) (75.5) (18.3)
Cash Flows from Investing Activities          
Purchase of customer trust funds marketable securities (694.8) (369.5) (598.5) (699.7) (610.6)
Proceeds from sale and maturity of customer trust funds marketable securities 707.9 395.9 610.2 677.6 557.0
Net change in restricted cash and other restricted assets held to satisfy customer trust funds obligations 610.1 252.4 (367.8) 677.8 405.3
Expenditures for property, plant, and equipment (6.8) (9.6) (17.5) (7.4) (8.8)
Expenditures for software and technology (21.9) (22.5) (33.1) (25.5) (25.3)
Net proceeds from divestitures     (0.5) 101.6  
Net proceeds from divestitures   0.9      
Net cash (used in) provided by investing activities - continuing operations 594.5 247.6 (407.2) 724.4 317.6
Net cash (used in) provided by investing activities-discontinued operations   (0.2) (0.2) 38.6 6.3
Net cash (used in) provided by investing activities 594.5 247.4 (407.4) 763.0 323.9
Cash Flows from Financing Activities          
(Decrease) increase in customer trust funds obligations, net (623.2) (278.8) 356.1 (655.7) (351.7)
Net proceeds from issuance of common stock 595.0 78.4 78.4 75.0  
Proceeds from issuance of common stock upon exercise of stock options 22.2        
Repurchase of stock   (1.8) (1.8)    
Proceeds from debt issuance 680.0        
Repayment of long-term debt obligations (1,132.3) (25.9) (25.9) (11.8) (7.0)
Payment of debt refinancing costs (23.3)        
Net cash provided by (used in) financing activities - continuing operations     406.8 (592.5) (358.7)
Net cash used in financing activities - discontinued operations       (38.2) (9.5)
Net cash provided by (used in) financing activities (481.6) (228.1) 406.8 (630.7) (368.2)
Effect of Exchange Rate Changes on Cash (1.5) 9.0 8.6 1.3 (10.4)
Net (decrease) increase in cash and equivalents 93.3 (36.4) (31.8) 58.1 (73.0)
Elimination of cash from discontinued operations 0.5 0.6 5.2 (0.5) 0.1
Cash and equivalents at beginning of period 94.2 120.8 120.8 63.2 136.1
Cash and equivalents at end of period $ 188.0 $ 85.0 94.2 120.8 63.2
Supplemental Cash Flow Information:          
Cash paid for interest     89.7 84.9 83.9
Cash paid for income taxes     21.3 14.8 15.7
Cash received from income tax refunds     $ 1.9 $ 0.2 $ 0.2