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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 391.3 $ 416.3 $ 416.9 $ 420.6 $ 372.8 $ 393.0 $ 384.2 $ 369.4 $ 1,645.1 $ 1,519.4 $ 1,450.6
Operating expenses                      
Cost of services (exclusive of depreciation and amortization) 204.8 216.0 222.6 224.2 202.0 209.6 211.9 210.8 867.6 834.3 792.5
Selling, general, and administrative expenses 103.8 107.4 111.2 108.0 93.0 109.1 124.1 118.9 430.4 445.1 420.7
Depreciation and amortization 25.3 26.4 26.8 23.0 24.0 24.3 25.9 26.0 101.5 100.2 109.9
Goodwill and other intangibles impairment 0.0 0.0 250.8 0.0         250.8 0.0 0.0
Gain on sale of property         (33.9) 0.0 0.0 0.0 0.0 (33.9) 0.0
Total operating expenses 333.9 349.8 611.4 355.2 285.1 343.0 361.9 355.7 1,650.3 1,345.7 1,323.1
Operating profit (loss) 57.4 66.5 (194.5) 65.4 87.7 50.0 22.3 13.7 (5.2) 173.7 127.5
Interest expense 39.3 39.4 38.8 38.3 35.4 32.3 25.9 25.6 155.8 119.2 125.7
Other (income) expense, net (3.1) 1.7 (21.3) 7.1 (7.7) 1.2 4.0 1.2 (15.6) (1.3) (12.5)
Loss on extinguishment of debt 0.0 0.0 1.1 0.0 0.2 9.3 7.7 0.0 1.1 17.2 0.0
Income (loss) from continuing operations before income taxes 21.2 25.4 (213.1) 20.0 59.8 7.2 (15.3) (13.1) (146.5) 38.6 14.3
Income taxes 7.6 12.7 (19.3) 7.3 17.9 6.7 (9.9) (4.7) 8.3 10.0 15.1
Income (loss) from continuing operations $ 13.6 $ 12.7 $ (193.8) $ 12.7 $ 41.9 $ 0.5 $ (5.4) $ (8.4) $ (154.8) $ 28.6 $ (0.8)
Basic (in dollars per share) $ 0.02 $ 0.01 $ (1.87) $ 0.01 $ 0.21 $ (0.09) $ (0.10) $ (0.16) $ (1.83) $ (0.10) $ (0.27)
Diluted (in dollars per share) $ 0.02 $ 0.01 $ (1.87) $ 0.01 $ 0.21 $ (0.09) $ (0.10) $ (0.16) $ (1.83) $ (0.10) $ (0.27)