Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 7.7	$ 7.8	$ 18.8	$ 24.8
Capitalized (cost) credit during the period	(1.4)	(2.8)	2.0	(6.6)
Amortization of capitalized (credit) cost during the period	(0.2)	2.9	0.2	5.2
Total stock-based compensation expense	6.1	7.9	21.0	23.4
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	2.6	2.6	8.4	8.2
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	2.1	1.7	6.1	5.8
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	1.9	1.4	5.7	4.5
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	0.0	0.0	1.4	1.3
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 1.1	$ 2.1	$ (2.8)	$ 5.0

Share-based Payment Arrangement, Amortization of Capitalized Cost

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