Fair Value Measurement - Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts receivable, net	$ 762,300,000		$ 634,700,000
Accounts receivable, allowances	11,800,000		12,500,000
Increase (decrease) in accounts receivable, allowances	(700,000)
Available for sale debt securities	58,500,000		57,700,000
Available for sale debt securities, amortized cost	57,400,000		56,400,000
Available for sale debt securities, allowance for credit losses	0
Available for sale debt securities, unrealized losses	100,000		100,000
Available for sale debt securities with unrealized losses, fair value	5,800,000		6,100,000
Trading securities	23,800,000		22,700,000
Purchase of trading securities related to deferred compensation plans	2,300,000	$ 2,500,000
Proceeds from securities sold	3,000,000.0	$ 1,600,000
Long-term debt	1,434,200,000		1,436,900,000
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	1,434,200,000		1,436,900,000
Long-term debt, fair value	$ 1,548,900,000		$ 1,569,500,000