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Earnings per Share - Computation of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income	$ 79.6	$ 98.8	$ 107.9	$ 105.3	$ 178.4	$ 213.2
Number of Basic Shares Outstanding (in share)	57,797,841		57,797,841		57,797,841	57,797,841
Number of Diluted Shares Outstanding (in share)	57,797,841		57,797,841		57,797,841	57,797,841
Earnings per share - basic (in dollars per share)	$ 1.38		$ 1.87		$ 3.09	$ 3.69
Earnings per share - diluted (in dollars per share)	$ 1.38		$ 1.87		$ 3.09	$ 3.69

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-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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