Income Taxes Valuation Allowances & Uncertain Tax Provisions (Details 5) (USD $) In Millions, unless otherwise specified	7 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	May 31, 2013	May 31, 2012
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Gross unrecognized tax benefits, beginning of period	$ 316.8	$ 99.2	$ 476.9
Prior year tax positions - increases	128.5	33.0	7.7
Current year tax positions	0.4	2.8	36.6
Prior year tax positions - decreases	(24.0)	0	(204.3)
Settlements	(323.7)	(32.6)	0
Currency translation	1.2	(1.8)	(0.1)
Gross unrecognized tax benefits, end of period	99.2	100.6	316.8	476.9
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate in future periods		100.0
Accrued interest and penalties related to unrecognized tax benefits, which are reflected in other noncurrent liabilities	28.8	20.0
Valuation Allowance [Abstract]
Net change in the deferred tax asset valuation allowance during the period	35.4	(100.9)	(86.6)	(29.0)
Change in deferred tax assets valuation allowance		32.8
Foreign Country [Member]
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Prior year tax positions - increases		21.3
Resolution of certain tax matters [Member]
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Prior year tax positions - decreases			(179.3)
APA Agreements [Member]
Changes in unrecognized tax benefits for all jurisdictions were as follows:
Settlements		(8.1)
Valuation Allowance [Abstract]
Change in deferred tax assets valuation allowance		$ 11.7