Income Taxes (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosures [Line Items]
U.S. tax reform - deemed repatriation tax	$ 36.6	$ 0.0	$ 0.0
Unrecognized Tax Benefits, Increase Resulting from Acquisition	0.0	28.5
Income Tax Effects Allocated Directly to Equity	$ 7.2	$ (1.8)	5.4
Federal Statutory Income Tax Rate	35.00%
Effective Income Tax Rate Reconciliation, Percent	(17.00%)	(28.40%)
Foreign subsidiary earnings	$ 14.4	$ 13.7	(9.1)
Income tax penalties and interest accrued	5.5	7.6
Operating loss carryforwards	730.9
Net loss carryforward, deferred tax asset	125.9	88.4
Operating loss carryforwards, set to expire	484.5
Operating loss carryforwards, no expiration	246.4
Tax credit carryforwards, foreign	77.3
Tax credit carryforwards, general business	4.6
Deferred tax asset, change in amount	(17.8)	23.9
Valuation Allowances and Reserves, Reserves of Businesses Acquired	9.1
Deferred tax liability not recognized, amount of unrecognized deferred tax liability	$ 604.1
Income tax expense		93.9	9.6
Minimum
Income Tax Disclosures [Line Items]
Recognition of tax positions, likelihood of being realized upon settlement	50.00%
Valuation Allowance of Deferred Tax Assets [Member]
Income Tax Disclosures [Line Items]
Income Tax Effects Allocated Directly to Equity	$ 9.9	$ 7.7	$ (20.4)