Financial Instruments and Risk Management (Rollforward of Contingent Consideration) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period	$ 223.6
Payments	26.0
Reclassifications	0.0
Accretion expense	2.4
Fair value loss	9.2
Balance at end of period	209.2
Other Current Liabilities [Member]
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period	100.5
Payments	26.0
Reclassifications	11.2
Accretion expense	0.0
Fair value loss	0.0
Balance at end of period	85.7
Other long-term obligations
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period	123.1
Payments	0.0
Reclassifications	(11.2)
Accretion expense	2.4
Fair value loss	9.2
Balance at end of period	$ 123.5