Derivative Instruments and Hedging Activities (Notional Value and Change in Fair Value of Net Investment Hedges) (Details) - Derivative instruments designated as hedging instruments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Foreign currency denominated debt
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, Before-Tax Amount	$ (4.2)	$ 0.0	$ 0.0
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, Income Tax	(1.1)	0.0	0.0
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, After-Tax Amount	(3.1)	0.0	0.0
Cross currency swap contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	300.0	300.0
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, Before-Tax Amount	(12.7)	20.5	11.0
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, Income Tax	(3.3)	5.3	3.2
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss, After-Tax Amount	$ (9.4)	$ 15.2	$ 7.8