Other Assets (Tables)

6 Months Ended

Jun. 30, 2023

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Assets

	December 31,		June 30,
	2022		2023
	(In millions)
Other noncurrent assets:
Restricted cash and cash equivalents	$	37.2	$	31.2
Note receivables - OPA		49.3		47.4
Operating lease right-of-use assets		21.5		21.6
Land held for development		29.7		18.9
IBNR receivables		16.8		14.2
Pension asset		9.3		8.8
Other		24.3		20.6
Total	$	188.1	$	162.7