Financial Instruments and Fair Value - Cash-Settled Award (Details) - shares	Sep. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-settled share based units (in shares)	4,746,711	1,878,220
Deferred compensation arrangements (in shares)	0	1,125,605
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-settled share based units (in shares)	1,751,649	1,878,220
Performance Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash-settled share based units (in shares)	2,995,062	0