Disposition of Subsidiary	9 Months Ended
	Sep. 30, 2021
Disposition of Subsidiary [Abstract]
Disposition of Subsidiary	Disposition of SubsidiaryIn the second quarter of 2021, we sold ICON, a specialty media company, to ICON's management team. As a result, we recorded a pre-tax gain of $50.5 million from the sale. As discussed in Note 7, the after-tax gain approximated the pre-tax gain. The disposition of ICON will not have a material impact on our ongoing results of operations or financial position.