Principles of Consolidation and Basis of Presentation Accounting Changes and Error Corrections (Details) - Restatement Adjustment [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
overstatement [Member] | Noncontrolling Interest [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 71.9
overstatement [Member] | AOCI Attributable to Parent [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	14.0
understatement [Member] | Additional Paid-in Capital [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ (57.9)