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Income Taxes Income Taxes - Deferred Tax Amounts Classified in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred income taxes	$ 775.5	$ 183.3
Noncurrent deferred tax liabilities	(624.9)	(1,090.0)
Net deferred tax assets (liabilities)	$ 150.6	183.3
Net deferred tax assets (liabilities)		$ (906.7)

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

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