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Quarterly Consolidated Financial Information (Unaudited) (Quarterly Financial Information Disclosure) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 266.9 $ 274.3 $ 234.0 $ 192.8 $ 254.3 $ 250.2 $ 233.2 $ 178.3 $ 968.0 $ 916.0 $ 826.0
Gross profit 88.8 97.2 74.8 60.1 85.5 74.5 74.5 55.4 320.9 289.9 267.9
Operating income 39.0 47.2 22.2 15.9 40.5 30.6 29.9 20.7 124.3 121.7 102.1
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 63.8 105.6 54.3
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 0.0 0.0 69.0
Net Income (Loss) Attributable to Parent $ 40.2 $ 33.7 $ 10.9 $ (21.0) $ 25.0 $ 15.3 $ 10.2 $ 55.1 $ 63.8 $ 105.6 $ 123.3
Net income (loss) per share(1)                      
Continuing operations                 $ 0.40 $ 0.67 $ 0.34
Discontinued operations                 0 0 0.43
Net income (loss) per basic share $ 0.26 $ 0.21 $ 0.07 $ (0.13) $ 0.16 $ 0.10 $ 0.06 $ 0.35 0.40 0.67 0.77
Continuing operations                 0.40 0.66 0.34
Income (Loss) from Discontinued Operations per share                 0 0 0.42
Net income (loss) per diluted share $ 0.25 $ 0.21 $ 0.07 $ (0.13) $ 0.16 $ 0.10 $ 0.06 $ 0.34 $ 0.40 $ 0.66 $ 0.76