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Long-term Debt and Short-term Borrowings (Narrative) (Details) € in Millions, $ in Millions, $ in Millions						12 Months Ended
	Sep. 30, 2023	Nov. 10, 2020 USD ($)	May 23, 2019 USD ($)	Jul. 26, 2018 USD ($)	Jan. 27, 2017 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 01, 2020 USD ($)	Apr. 30, 2020	May 22, 2019 USD ($)	Jan. 27, 2017 EUR (€)	Jan. 27, 2017 AUD ($)
Debt Instrument [Line Items]
Total debt						$ 1,136.6	$ 816.0
Maximum Consolidated Leverage Ratio										3.75
Debt issuance costs						3.2	3.4	$ 0.6
Senior Secured Credit Facility Due January 2022
Debt Instrument [Line Items]
Credit agreement, term					5 years
Senior Secured Notes | Euro Term Loan A
Debt Instrument [Line Items]
Credit agreement, face amount					$ 320.8							€ 300.0
Senior Secured Notes | AUD Term Loan A
Debt Instrument [Line Items]
Max borrowing capacity					60.4								$ 80.0
Senior Secured Notes | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.50% at December 31, 2020 and 3.44% at December 31, 2019)
Debt Instrument [Line Items]
Total debt			$ 100.0			92.5	97.5
Senior Secured Notes | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Debt issuance costs		$ 3.2
Senior Secured Notes | Minimum | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Quarterly principal payment, based on annual percentage			1.25%
Senior Secured Notes | Forecast | Maximum | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Quarterly principal payment, based on annual percentage	2.50%
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)
Debt Instrument [Line Items]
Total debt						375.0	$ 375.0
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes
Debt Instrument [Line Items]
Consolidated Leverage Ratio											2.50
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio											1.25
Revolving Facility | Senior Secured Notes
Debt Instrument [Line Items]
Max borrowing capacity					400.0
Revolving Facility | Senior Secured Notes | Senior Secured Credit Facility Due January 2022
Debt Instrument [Line Items]
Max borrowing capacity				$ 500.0							$ 500.0
Credit facility, increase				$ 100.0
Revolving Facility | Senior Secured Notes | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Max borrowing capacity			$ 600.0
Total debt						332.6
Amount available for borrowings under the Restated Revolver Facility						256.8
Letters of credit outstanding, amount						$ 10.6
Commitment fee percent						0.50%
Revolving Facility | Senior Secured Notes | Minimum | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Commitment fee percent						0.20%
Revolving Facility | Senior Secured Notes | Maximum | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Commitment fee percent						0.50%
Revolving Facility | Senior Secured Notes | Euro Floor | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Base rate percent						0.00%
Revolving Facility | Senior Secured Notes | U.S. Floor | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Base rate percent						1.00%
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes
Debt Instrument [Line Items]
Interest Coverage Ratio						5.44
Consolidated Leverage Ratio			3.25
Maximum Consolidated Leverage Ratio						4.75			4.75
Maximum Consolidated Leverage Ratio, decrease										3.75
Facility paydown when cash and cash equivalents exceed, amount									$ 100.0
Amended maximum Consolidated Leverage Ratio		0.50
Leverage ratio						4.30
Debt instrument, basis spread on variable rate		2.50%
Dividends and/or purchase shares, threshold						$ 30.0
Dividends and/or purchase shares, threshold, percent of total assets						1.00%
Minimum leverage ratio for payment of dividends or repurchase of shares						3.25
Consolidated Leverage Ratio, greater than						3.75
Maximum borrowing capacity, potential increase					$ 500.0
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Consolidated Leverage Ratio			3.25
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Minimum
Debt Instrument [Line Items]
Interest Coverage Ratio			3.00			3.00
Senior Secured Credit Facility Due May 2024 | Senior Secured Notes | Maximum
Debt Instrument [Line Items]
Dividends and/or purchase shares, threshold						$ 75.0

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