Income Tax Unrecognized Tax Benefits Balance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 29, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Estimated interest and penalties	$ 7.2	$ 15.5	$ 8.5
Offsetting positions	(3.7)	(3.8)	(1.9)
Unrecognized tax positions	59.8	137.9	109.2	104.4
Total unrecognized tax benefits	63.3	149.6	115.8
Presented net against non-current deferred tax assets	37.9	0	0
Current (included in accounts payable and other current liabilities)	0	42.5	0.3
Non-current	25.4	107.1	115.5
Amount of unrecognized tax benefits that would impact the effective tax rate	$ 59.8	$ 137.9	$ 109.2