Other Assets (Tables)

9 Months Ended

Sep. 30, 2023

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Assets

	December 31,		September 30,
	2022		2023
	(In millions)
Other noncurrent assets:
Restricted cash and cash equivalents	$	37.2	$	31.2
Note receivables - OPA		49.3		47.9
Operating lease right-of-use assets		21.5		21.0
Land held for development		29.7		19.9
IBNR receivables		16.8		13.5
Pension asset		9.3		9.0
Other		24.3		17.4
Total	$	188.1	$	159.9