Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 83.6	$ 84.2
Other comprehensive income (loss):
Foreign currency translation adjustments	(1.2)	(2.5)
Net change in pension and post-retirement liabilities	(1.4)	(3.0)
Reclassification of pension and post-retirement benefit losses into earnings	1.3	2.2
Pension settlements	0.1	0.7
Net change in fair value of cash flow hedges	19.6	9.6
Reclassification of cash flow hedge (gains) losses into earnings	(7.5)	(4.4)
Other comprehensive income before taxes	10.9	2.6
Tax expense	(3.3)	(4.6)
Other comprehensive income (loss), net of tax	7.6	(2.0)
Comprehensive income	$ 91.2	$ 82.2