Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 170.0	$ 100.0	$ 254.2	$ 112.9
Other comprehensive income (loss):
Foreign currency translation adjustments	4.2	2.4	1.6	(17.8)
Net change in pension and post-retirement liabilities	(2.3)	(1.5)	(5.3)	(2.4)
Reclassification of pension and post-retirement benefit losses into earnings	2.1	1.4	4.3	3.0
Pension settlement	0.0	0.0	0.7	0.0
Net change in fair value of cash flow hedges	11.0	6.3	20.6	(8.3)
Reclassification of cash flow hedge (gains) losses into earnings	(9.1)	5.8	(13.5)	7.0
Other comprehensive income (loss) before taxes	5.9	14.4	8.4	(18.5)
Tax benefit (expense)	0.2	(3.0)	(4.3)	0.6
Other comprehensive income (loss), net of tax	6.1	11.4	4.1	(17.9)
Comprehensive income	$ 176.1	$ 111.4	$ 258.3	$ 95.0