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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	$ 5.9	$ 8.2	$ 11.1	$ 17.0
Capitalized credit (cost) during the period	0.1	(2.6)	3.4	(3.8)
Amortization of capitalized (credit) cost during the period	(3.8)	1.7	0.4	2.3
Total stock-based compensation expense	2.2	7.3	14.9	15.5
Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	2.6	2.5	5.8	5.6
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	1.9	2.1	4.0	4.1
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax compensation expense	1.7	1.5	3.8	3.1
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	$ (0.3)	$ 2.1	$ (3.9)	$ 2.9

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Share-based Payment Arrangement, Amortization of Capitalized Cost

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