Leases - Impact of Leasing, Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
Operating lease assets	$ 118.2	$ 114.1
Short-term operating lease liabilities	27.2	28.3
Long-term operating lease liabilities	75.5	71.3
Total operating lease liabilities	102.7	99.6
Finance Leases
Property, plant and equipment, net	5.3	5.0
Current portion of long-term debt	0.8	0.5
Long-term debt	2.9	2.9
Total finance lease liabilities	$ 3.7	$ 3.4
Finance lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance lease, liability, current, statement of financial position [Extensible List]	us-gaap:LongTermDebtCurrent	us-gaap:LongTermDebtCurrent
Finance lease, liability, noncurrent, statement of financial position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent