Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	$ 11.7	$ 5.2	$ 23.1	$ 10.8
Capitalized (cost) credit during the period	(5.9)	0.2	(9.3)	2.9
Amortization of capitalized cost (credit) during the period	8.8	(3.3)	14.3	0.2
Total stock-based compensation expense	14.6	2.1	28.1	13.9
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	2.3	2.3	5.9	5.5
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	1.7	1.8	3.9	3.8
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation cost incurred	1.8	1.5	4.3	3.5
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	$ 5.9	$ (0.4)	$ 9.0	$ (3.4)

Share-based Payment Arrangement, Amortization of Capitalized Cost

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