Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Stock Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Stock Compensation Plans (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stock Compensation Plans:
Stock compensation expense	$ 104.0	$ 100.0	$ 251.0	$ 234.0
Stock options
Stock Compensation Plans:
Stock options granted in period (shares)	32,000	16,800	1,404,400	1,241,800
Award vesting period			3 years
Award expiration period			10 years
Unrecognized compensation cost	$ 323.0		$ 323.0
Remaining period over which to recognize unrecognized compensation expense			2 years
Restricted stock
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	6,800	4,600	6,800	4,600
Award vesting period			1 year
Unrecognized compensation cost	$ 0.3		$ 0.3
Remaining period over which to recognize unrecognized compensation expense			10 months
Restricted stock units
Stock Compensation Plans:
Awards other than stock options granted in period (shares)	19,500	9,100	443,100	354,200
Award vesting period			3 years
Unrecognized compensation cost	$ 323.0		$ 323.0
Remaining period over which to recognize unrecognized compensation expense			2 years