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Quarterly Financial Data (Unaudited)
12 Months Ended
Dec. 31, 2023
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)
Information for any one quarterly period is not necessarily indicative of the results that may be expected for the year.
2023 Quarter Ended
March 31June 30Sept. 30Dec. 31
Operating revenues$420.6 $416.9 $416.3 $391.3 
Operating expenses
Cost of services (exclusive of depreciation and amortization)224.2 222.6 216.0 204.8 
Selling, general, and administrative108.0 111.2 107.4 103.8 
Depreciation and amortization23.0 26.8 26.4 25.3 
Goodwill and other intangibles impairment— 250.8 — — 
Total operating expenses355.2 611.4 349.8 333.9 
Operating profit (loss)
65.4 (194.5)66.5 57.4 
Interest expense38.3 38.8 39.4 39.3 
Other (income) expense, net7.1 (21.3)1.7 (3.1)
Loss on extinguishment of debt— 1.1 — — 
Income (loss) from continuing operations before income taxes20.0 (213.1)25.4 21.2 
Income taxes7.3 (19.3)12.7 7.6 
Income (loss) from continuing operations$12.7 $(193.8)$12.7 $13.6 
Income (loss) from continuing operations per share
Basic$0.01 $(1.87)$0.01 $0.02 
Diluted$0.01 $(1.87)$0.01 $0.02 


2022 Quarter EndedMarch 31June 30Sept. 30Dec. 31
Operating revenues$369.4 $384.2 $393.0 $372.8 
Operating expenses
Cost of services (exclusive of depreciation and amortization)210.8 211.9 209.6 202.0 
Selling, general, and administrative118.9 124.1 109.1 93.0 
Depreciation and amortization26.0 25.9 24.3 24.0 
Gain on sale of property— — — (33.9)
Total operating expenses355.7 361.9 343.0 285.1 
Operating profit
13.7 22.3 50.0 87.7 
Interest expense25.6 25.9 32.3 35.4 
Other (income) expense, net1.2 4.0 1.2 (7.7)
Loss on extinguishment of debt— 7.7 9.3 0.2 
Income (loss) from continuing operations before income taxes(13.1)(15.3)7.2 59.8 
Income taxes(4.7)(9.9)6.7 17.9 
Income (loss) from continuing operations$(8.4)$(5.4)$0.5 $41.9 
Income (loss) from continuing operations per share
   Basic$(0.16)$(0.10)$(0.09)$0.21 
   Diluted$(0.16)$(0.10)$(0.09)$0.21