Other Assets (Tables)

9 Months Ended

Sep. 30, 2020

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Assets

	December 31,		September 30,
	2019		2020
	(In millions)
Other noncurrent assets:
Land held for development	$	125.3	$	95.5
Operating lease right-of-use assets		29.0		26.8
Restricted cash and cash equivalents		33.0		33.8
IBNR receivables		8.5		32.6
Marketable securities		6.2		5.6
Pension asset		7.4		8.3
Note receivables - OPA		8.8		27.3
Other		11.9		8.1
Total	$	230.1	$	238.0