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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	4 Months Ended	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component		$ 220.0
Letters of Credit Outstanding, Amount				$ 36.5
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, Fair Value Disclosure		940.8		575.7
Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, Fair Value Disclosure		581.0		0.0
Notes Receivable | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, Fair Value Disclosure				$ 266.7
Revolving Credit Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Letters of Credit Outstanding, Amount		27.0
Supplemental Executive Retirement Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in unrealized gains (losses) included in other income	$ 1.2	$ 3.2	$ 5.0

X

- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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