Other Assets (Tables)

3 Months Ended

Mar. 31, 2022

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Assets

	December 31,		March 31,
	2021		2022
	(In millions)
Other noncurrent assets:
Restricted cash and cash equivalents	$	41.9	$	43.9
Note receivables - OPA		38.7		36.0
Land held for development		36.0		31.0
IBNR receivables		34.4		29.9
Operating lease right-of-use assets		19.9		21.5
Pension asset		9.0		9.5
Marketable securities		3.3		2.9
Other		16.8		16.0
Total	$	200.0	$	190.7