Other Assets (Tables)

6 Months Ended

Jun. 30, 2022

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Assets

	December 31,		June 30,
	2021		2022
	(In millions)
Other noncurrent assets:
Restricted cash and cash equivalents	$	41.9	$	36.8
Note receivables - OPA		38.7		36.6
IBNR receivables		34.4		30.7
Land held for development		36.0		27.2
Operating lease right-of-use assets		19.9		19.3
Pension asset		9.0		8.4
Marketable securities		3.3		3.5
Other		16.8		19.1
Total	$	200.0	$	181.6