Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 5.2	$ 8.8
Capitalized credit (cost) during the period	3.3	(1.2)
Amortization of capitalized cost during the period	4.2	0.6
Total stock-based compensation expense	12.7	8.2
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	3.2	3.1
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	2.1	2.0
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	2.1	1.6
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	1.4	1.3
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ (3.6)	$ 0.8

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