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Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Basis of Presentation (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Earnings (loss) before income taxes and discontinued operations	$ 18.8	$ (18.4)	$ 34.0	$ (29.0)
Treasury Stock, Shares	2,089,487		2,089,487		1,078,363
Operating Lease, Liability, Noncurrent	$ 18.1		$ 18.1		$ 18.7
Treasury Stock, Shares, Acquired			1,011,124
Payments for Repurchase of Common Stock			$ 20.0	15.0
Noncash Investing and Financing Items
Purchases of property and equipment included in accounts payable			1.5	$ 3.3
Property Subject to Operating Lease
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Loss Contingency Accrual	$ 2.2		$ 2.2