Accumulated Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	$ 10.9	$ 15.6	$ 20.2	$ 30.1
Income tax expense	1.1	1.3	1.4	1.8
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)			1.7	4.2
Net pension income	(3.1)	(3.5)	(6.3)	(7.6)
Earnings before income taxes and equity in loss of unconsolidated entity	6.4	35.9	5.7	46.5
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense	(0.1)	0.0	(0.4)	0.0
Earnings before income taxes and equity in loss of unconsolidated entity	0.7	2.4	2.1	4.2
Total reclassifications for the period, net of tax	0.6	2.4	1.7	4.2
Interest Rate Swap Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)			1.7	3.6
Interest Rate Swap Adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense	0.7	1.8	2.1	3.6
Income tax expense	(0.1)	0.0	(0.4)	0.0
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.6	1.8	1.7	3.6
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income tax expense	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive loss to net earnings (loss)	0.0	0.6	0.0	0.6
Net pension income	$ 0.0	$ 0.6	$ 0.0	$ 0.6