Discontinued Operations - Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 10.3	$ 5.5	$ 5.4	$ 7.5
Current assets held for sale	256.5	253.6
Non-current assets held for sale	983.3	994.5
Current liabilities held for sale	126.5	114.7
Non-current liabilities held for sale	48.0	47.7
Discontinued Operations, Held-for-Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	10.3	5.5
Accounts receivable, net of allowances	101.9	119.3
Inventories	91.2	81.1
Other current assets	53.1	47.7
Current assets held for sale	256.5	253.6
Property, plant and equipment, net	70.8	70.1
Goodwill	711.7	713.0
Intangibles, net	154.7	166.5
Other non-current assets	46.1	44.9
Non-current assets held for sale	983.3	994.5
Accounts payable	54.9	35.9
Employee compensation and benefits	18.3	19.5
Other current liabilities	53.3	59.3
Current liabilities held for sale	126.5	114.7
Pension and other post-retirement compensation and benefits	12.1	12.6
Deferred tax liabilities	13.0	14.1
Other non-current liabilities	22.9	21.0
Non-current liabilities held for sale	$ 48.0	$ 47.7