Stock-Based Compensation Programs - Compensation expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-Based Compensation Programs
Share based compensation expense	$ 37.0	$ 75.0	$ 46.0
Expenses for share-based compensation arrangements, after tax	33.0	61.0	35.0
Unrecognized compensation cost related to nonvested share-based compensation arrangements	$ 50.0
Expected weighted-average period for recognition of unrecognized stock-based compensation costs	2 years 2 months 12 days
Special Acquisition Related Incentive Plan [Member] \| Business consolidation and other activities
Stock-Based Compensation Programs
Share based compensation expense	$ 6.0	$ 23.0	$ 11.0

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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