Income Taxes (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosures [Line Items]
Federal Statutory Income Tax Rate	21.00%	21.00%	21.00%	35.00%
U.S. taxed foreign income	$ 8.7	$ 10.5	$ 32.6
Tax Act - rate impact on deferred tax balance	$ 0.0	$ 0.0	$ 2.5
Effective Income Tax Rate Reconciliation, Percent	0.40%	(51.00%)	(7.80%)
Foreign tax expense (benefit)	$ 14.6	$ 36.1	$ 49.0
Income tax penalties and interest accrued	3.7	8.5
Operating loss carryforwards	1,003.3
Net loss carryforward, deferred tax asset	175.6	197.1
Operating loss carryforwards, set to expire	601.0
Operating loss carryforwards, no expiration	402.3
Tax credit carryforwards, foreign		61.2
Tax credit carryforwards, general business		4.9
Deferred tax asset, change in amount	11.8	42.3
Income Tax Expense (Benefit)	(1.0)	116.7	37.2
Deferred tax liability not recognized, amount of unrecognized deferred tax liability	531.1
Decrease in Unrecognized Tax Benefits is Reasonably Possible	15.0
Other	9.1	(5.0)	$ (0.1)
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	10.7
Income Tax Reversal Due To Expiration	(10.0)
Income Tax Expense (Benefit)	$ 32.5