Fair Value Measurements and Other Comprehensive Income (OCI) Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2014	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		$ 0.0	$ 0.0
Liabilities, Fair Value Disclosure, Recurring		$ 0.0	$ 0.0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Project Related Impairment	$ 92.9
Income (Loss) from Impairment Attributable to Noncontrolling Interest	(82.9)
Income (Loss) from Impairments Attributable to Parent	$ (10.0)