Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2016
Remeasurement of deferred tax balances	0.00%	0.30%	(21.20%)
Acquisition And Purchase Accounting For Valuation Allowance Deferred Tax Assets	$ (53,300,000)	$ 0		$ 0
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		(30,000,000.0)	$ 21,000,000.0
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)		$ 9,000,000.0
Change in permanent reinvestment assertion	0.00%	(2.30%)	8.40%
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability due to Transition Tax		$ 24,600,000	$ 160,700,000
Income tax holiday, aggregate dollar amount	$ 33,100,000	25,400,000	19,700,000
Undistributed earnings	4,400,000,000
Unrecognized tax benefits	78,200,000	83,000,000.0	120,500,000		$ 107,100,000
Unrecognized tax benefits that would impact effective tax rate	54,100,000
Unrecognized tax benefits, income tax penalties and interest accrued	16,900,000	20,700,000
Unrecognized tax benefits, income tax penalties and interest expense recognized	1,000,000.0	13,400,000
Tax benefit to continuing operations	353,700,000	$ 281,300,000	$ 80,200,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 4,400,000
Period Changes In Unrecognized Tax Benefit, in months	12
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Percent	20.30%	16.90%	5.70%
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries	$ 400,000,000.0
Remeasurement of U.S. deferred tax balances [Member]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)			$ (300,600,000)
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)		$ 4,800,000
Change in permanent reinvestment assertion [Member]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)			$ 118,900,000
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)		(38,400,000)
Transition Tax [Member]
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability due to Transition Tax		185,300,000
Change in permanent reinvestment assertion [Member]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		80,500,000
Remeasurement of U.S. deferred tax balances [Member]
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		$ (295,800,000)