Financial Instruments and Risk Management (Rollforward of Contingent Consideration) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Current Portion
Balance at beginning of period	$ 59.5
Payments	(19.9)
Reclassifications	(2.5)
Accretion	0.0
Fair value loss	0.0
Balance at end of period	37.1
Long-Term Portion
Balance at beginning of period	496.6
Payments	0.0
Reclassifications	2.5
Accretion	2.4
Fair value loss	(171.4)
Balance at end of period	330.1
Total Contingent Consideration
Balance at beginning of period	556.1
Payments	(19.9)
Reclassifications	0.0
Accretion	2.4
Fair value loss	(171.4)
Balance at end of period	$ 367.2