Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 393.0	$ 243.6
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net	(10.5)	(11.4)
Unrealized gains on derivative contracts, net	30.7	7.0
Amortization of prior service costs and actuarial losses, net	6.6	10.6
Total other comprehensive income, net of tax	26.8	6.2
Comprehensive income	$ 419.8	$ 249.8