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Long-Term Debt And Short-Term Borrowings (Narrative) (Details) € in Millions, $ in Millions, $ in Millions				1 Months Ended	3 Months Ended	6 Months Ended
	May 23, 2019 USD ($)	Jul. 26, 2018 USD ($)	Jan. 27, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	May 22, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 27, 2017 EUR (€)	Jan. 27, 2017 AUD ($)
Debt Instrument [Line Items]
Payments for debt issuance costs						$ 3.3	$ 0.0
Total debt				$ 1,104.8	$ 1,104.8	1,104.8			$ 888.0
Five Year Senior Secured Credit Facility Maturing January 2022
Debt Instrument [Line Items]
Debt Instrument, Term			5 years
Secured Debt | Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Payments for debt issuance costs					3.3
Secured Debt | USD Senior Secured Term Loan A, due May 2024 (floating interest rate of 3.96% at June 30, 2019)
Debt Instrument [Line Items]
Total debt	$ 100.0			100.0	100.0	100.0			0.0
Secured Debt | Euro Term Loan A
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 320.8							€ 300.0
Secured Debt | AUD Term Loan A
Debt Instrument [Line Items]
Maximum borrowing capacity			60.4								$ 80.0
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)
Debt Instrument [Line Items]
Total debt				375.0	375.0	375.0			$ 375.0
Revolving Facility | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity	600.0	$ 500.0	$ 400.0					$ 500.0
Line of Credit Facility, Increase (Decrease), Net	$ 200.0	$ 100.0
Total debt				296.5	296.5	296.5
Amount available for borrowings under Senior Secured Revolving Credit Facilities				286.0	286.0	286.0
Letters of credit outstanding				$ 17.5	$ 17.5	$ 17.5
Senior Secured Credit Facility Due May 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Increase (Decrease)				25.00%
Senior Secured Credit Facility Due May 2024 | Secured Debt
Debt Instrument [Line Items]
Debt Instrument, Minimum Leverage Ratio for Payments of Dividends or Repurchase of Shares	3.25							2.50
Minimum | Senior Secured Credit Facility Due May 2024 | Secured Debt
Debt Instrument [Line Items]
Consolidated Fixed Charge Coverage Ratio								1.25
Interest Coverage Ratio	3.00

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