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Subsequent Events (Narrative) (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Oct. 13, 2020 $ / shares	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Mar. 16, 2020 USD ($)	Feb. 29, 2020 USD ($)
Subsequent Events [Line Items]
Dividend payable, declared date			Oct. 05, 2020
Dividends payable, date to be paid			Oct. 30, 2020
Dividend payable, record date			Oct. 16, 2020
Seventh Amended Credit Facility [Member]
Subsequent Events [Line Items]
Revolving credit facility, amount			$ 150.0	$ 150.0	$ 100.0
Consolidated leverage ratio			3
Maturity date			Mar. 16, 2025
First Amendment To Credit Agreement [Member]
Subsequent Events [Line Items]
Revolving credit facility, amount		$ 150.0
Maturity date			Sep. 30, 2025
Other Unsecured Debt [Member]
Subsequent Events [Line Items]
Revolving credit facility, amount			$ 35.0
Subsequent Events [Member]
Subsequent Events [Line Items]
Cash dividend declared | $ / shares	$ 0.67
Subsequent Events [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Events [Line Items]
Spread on variable rate		0.90%
Subsequent Events [Member] | Prime Rate [Member]
Subsequent Events [Line Items]
Spread on variable rate		0.00%
Subsequent Events [Member] | Seventh Amended Credit Facility [Member]
Subsequent Events [Line Items]
Payment of borrowings		$ 50.0
Subsequent Events [Member] | First Amendment To Credit Agreement [Member]
Subsequent Events [Line Items]
Consolidated leverage ratio		3.5
Debt instrument, maximum restriction amount		$ 10.0
Debt instrument, maximum restriction amount, not covered by other exception		15.0
Subsequent Events [Member] | Other Unsecured Debt [Member]
Subsequent Events [Line Items]
Revolving credit facility, amount		125.0
Subsequent Events [Member] | Third Amendment To Note Agreement [Member]
Subsequent Events [Line Items]
Principal amount		$ 52.0
Subsequent Events [Member] | Third Amendment To Note Agreement - Series B Notes [Member]
Subsequent Events [Line Items]
Interest rate		2.50%
Maturity date		Nov. 15, 2027
Principal amount		$ 26.0
Subsequent Events [Member] | Third Amendment To Note Agreement - Series C Notes [Member]
Subsequent Events [Line Items]
Interest rate		2.69%
Maturity date		Nov. 15, 2030
Principal amount		$ 26.0
United Kingdom Subsidiary [Member] | Seventh Amended Credit Facility [Member]
Subsequent Events [Line Items]
Revolving credit facility, amount					$ 50.0

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Aggregate dividends declared during the period for each share of common stock outstanding.

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