Basis of Presentation and Summary of Significant Accounting and Financial Reporting Policies New Accounting Pronouncement, Early Adoption Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jan. 01, 2016	Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes	$ 736.4	$ 739.5		$ 736.4			$ 714.3
Provision for income taxes	21.5	(21.2)	$ 17.9	42.7	$ 35.4
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		74.3		136.8	$ (309.4)
New Accounting Pronouncement, Early Adoption, Effect [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes	77.0	75.5		77.0		$ 72.3
Deferred Tax Assets, Gross, Noncurrent	95.3			95.3		90.6
Deferred Tax Assets, Valuation Allowance, Noncurrent	18.3			18.3		$ 18.3
Provision for income taxes	$ 1.5	3.2		$ 4.7
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		$ 4.7