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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 254.3 | $ 250.2 | $ 233.2 | $ 178.3 | $ 226.9 | $ 232.2 | $ 199.7 | $ 167.2 | $ 916.0 | $ 826.0 | $ 800.6
Intangible Assets, Net (Including Goodwill) | 420.2 |  |  |  | 439.3 |  |  |  | 420.2 | 439.3 |
Total assets | 1,291.9 |  |  |  | 1,258.3 |  |  |  | $ 1,291.9 | 1,258.3 |
Document Period End Date |  |  |  |  |  |  |  |  | Sep. 30, 2018 |  |
Property, plant and equipment, net | 150.9 |  |  |  | 122.3 |  |  |  | $ 150.9 | 122.3 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 812.2 | 732.0 | 716.5
Property, plant and equipment, net | 144.8 |  |  |  | 116.1 |  |  |  | 144.8 | 116.1 |
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 71.7 | 62.3 | 57.1
Property, plant and equipment, net | 3.4 |  |  |  | 3.0 |  |  |  | 3.4 | 3.0 |
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 32.1 | 31.7 | $ 27.0
Property, plant and equipment, net | $ 2.7 |  |  |  | $ 3.2 |  |  |  | $ 2.7 | $ 3.2 |

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