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Share-based Payments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Stock options, Weighted average exercise price
Vesting period	3 years
Recognized compensation expense	$ 15.4	$ 21.3
Unrecognized compensation expense	$ 68.0		$ 50.0
Employee Stock Option
Shares of stock under options
Balance at the beginning of the period (in shares)	0.4	0.1
Granted (in shares)	0.0
Options exercised (in shares)	0.0
Options forfeited or expired ( in shares)	0.0
Balance at the end of the period (in shares)	0.4	0.1
Vested and expected to vest in the future at the end of the period (in shares)	0.1	0.1
Stock options, Weighted average exercise price
Balance at the beginning of the period (in dollars per share)	$ 36.41	$ 31.62
Granted (in dollars per share)	0
Options exercised (in dollars per share)	0
Cancelled (in dollars per share)	0
Balance at the end of the period (in dollars per share)	36.41	31.62
Vested and expected to vest in the future at the end of the period (in dollars per share)	$ 31.62	31.62
Performance Earnings Program
Stock options, Weighted average exercise price
Vesting period	3 years
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 52.50	43.06
Restricted Stock Units
Stock options, Weighted average exercise price
Weighted average grant-date fair value of stock options granted (in dollars per share)	$ 47.87	$ 43.06

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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