Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Expense	$ 17,800,000	$ 25,900,000	$ 41,400,000	$ 67,100,000
Income (loss) before Income Taxes and Equity Income of Unconsolidated Entities	$ 139,500,000	$ 72,800,000	271,100,000	192,100,000
Income Tax (Expense) Benefit, Business Combination			(4,000,000)
Discrete tax benefit			11,000,000
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Income Tax Expense			2,000,000
Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit)			(11,000,000)
Provisional tax amount			0
Deferred Foreign Income Tax Expense (Benefit)			$ 2,000,000
Discrete tax benefit, reduction of long-term deferred tax liability				3,000,000
Discrete tax benefit, share based payments to employees that vested during period				2,000,000
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount				$ 1,000,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward					$ 327,000,000