Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Proceeds from sales	$ 29.9	$ 44.4	$ 65.1	$ 87.7
Realized gross gains on sales	0.1	0.7	0.2	1.8
Realized gross losses on sales	$ 0.7	$ 0.4	$ 1.5	$ 0.8