Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	$ 5.3	$ 6.7	$ 28.4	$ 17.5
Capitalized (cost) credit during the period	0.0	(1.1)	(9.3)	1.8
Amortization of capitalized (credit) cost during the period	0.0	(0.1)	14.3	0.1
Total stock-based compensation expense	5.3	5.5	33.4	19.4
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	1.9	2.1	7.8	7.6
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	1.7	2.0	5.6	5.8
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	1.7	1.7	6.0	5.2
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	0.0	0.0	0.0	1.4
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	$ 0.0	$ 0.9	$ 9.0	$ (2.5)

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