Financial Instruments and Fair Value Measurements (Assets Measured on a Nonrecurring Basis) (Details) - Nonrecurring Basis - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain/(Loss) on equity investment			$ (8.4)	$ 0.0
Gain/(Loss) on assets held and used	$ (6.5)	$ (0.5)	(8.9)	(2.7)
Gain/(Loss) on assets held for sale	(1.3)		(1.3)	0.0
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment	49.8		49.8		$ 56.7
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investment	48.3	0.0	48.3	0.0
Long-lived assets held and used	0.0	0.0	0.0	0.0
Long-lived assets held for sale	$ 12.1	$ 0.0	$ 12.1	$ 0.0

Fair value portion of assets classified as held for sale.

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