Income Taxes (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosures [Line Items]
Federal Statutory Income Tax Rate	21.00%	21.00%	35.00%
U.S. taxed foreign income	$ 10.5	$ 32.6	$ 36.6
Income Tax Effects Allocated Directly to Equity	19.1	(8.5)	(7.2)
Impact of Tax Cuts and Jobs Act of 2017 tax expense recorded		41.1
Transition Tax on Foreign Fiscal Year		8.5
Tax Act Of 2017 Income Tax Expense Benefit			81.7
Tax Act - rate impact on deferred tax balance	$ 0.0	$ 2.5	$ (45.1)
Effective Income Tax Rate Reconciliation, Percent	(51.00%)	(7.80%)	(14.70%)
Foreign tax expense (benefit)	$ 36.1	$ 49.0	$ 72.9
Income tax penalties and interest accrued		8.5	6.3
Operating loss carryforwards	1,085.3
Net loss carryforward, deferred tax asset	197.1	160.0
Operating loss carryforwards, set to expire	619.7
Operating loss carryforwards, no expiration	465.6
Tax credit carryforwards, foreign		61.6
Tax credit carryforwards, general business		3.5
Deferred tax asset, change in amount	42.3	69.8
Income Tax Expense (Benefit)	116.7	$ 37.2	28.3
Deferred tax liability not recognized, amount of unrecognized deferred tax liability	593.6
Decrease in Unrecognized Tax Benefits is Reasonably Possible	7.0
Minimum
Income Tax Disclosures [Line Items]
Recognition of tax positions, likelihood of being realized upon settlement		50.00%
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Income Tax Disclosures [Line Items]
Income Tax Effects Allocated Directly to Equity	2.4	$ 11.6	$ (9.9)
BARBADOS
Income Tax Disclosures [Line Items]
Foreign tax expense (benefit)		$ 46.3
U.S. Foreign And State Authority
Income Tax Disclosures [Line Items]
Income Tax Effects Allocated Directly to Equity	1.3
Income Tax Reversal Due To Expiration	(2.6)
Income Tax Expense (Benefit)	$ 46.2