Discontinued Operations - Income for Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Income from discontinued operations, net of tax	$ 220.3	$ 6.1	$ 6.4	$ 6.4	$ 239.2
Disposed of by held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Gain on sale of business, net of taxes	224.2
Depreciation expense, discontinued operations					0.7	$ 1.1
Disposed of by held for sale | Cryobiological products business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Sales					59.9	83.6
Cost of sales					31.8	44.3
Selling, general and administrative expenses					7.8	10.4
Operating income					20.3	28.9
Interest expense, net					7.4	10.6
Other (income) expense, net					(0.8)
Other (income) expense, net						0.1
Income before income taxes					13.7	18.2
Income tax (benefit) expense					(1.3)	3.2
Income from discontinued operations before gain on sale of businesses					15.0	15.0
Gain on sale of business, net of taxes					224.2	0.0
Income from discontinued operations, net of tax					239.2	15.0
Tax on gain on sale of business	$ 25.2
Assets disposed of by sales | Cryobiological products business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Interest expense, net					7.4	$ 10.6
Gain on sale of business, net of taxes					224.2
Tax on gain on sale of business					$ 25.2