Leases and Commitments - Balance Sheet Implication (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Right-of-use assets	$ 153.1	$ 175.4
Finance right-of-use assets	2.4	2.4
Total right-of-use assets	$ 155.5	$ 177.8
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent	us-gaap:OtherAccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesCurrent	us-gaap:OtherAccruedLiabilitiesCurrent
Liabilities
Operating lease liabilities	$ 46.2	$ 45.7
Finance lease liabilities	1.1	1.0
Total current lease liabilities	47.3	46.7
Noncurrent
Operating lease liabilities	$ 120.9	$ 143.3
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent
Finance lease liabilities	$ 1.5	$ 1.4
Total noncurrent lease liabilities	122.4	144.7
Total lease liability	$ 169.7	$ 191.4
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization