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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Apr. 01, 2017	Jun. 30, 2017	Apr. 01, 2017	Jun. 30, 2016	Jun. 30, 2016	Jan. 01, 2018
Income Taxes
Income tax provision (benefit)	$ (266.0)	$ 4.7	$ (263.8)	$ (37.6)	$ (97.4)
Foreign Tax Authority
Income Taxes
Income tax provision (benefit)		$ 0.1	$ 9.4	$ (5.3)	$ 2.4
Scenario, Forecast
Income Taxes
Gross net operating losses, retain estimate						$ 4,000.0
Tax credit, retain estimate						100.0
Alternative minimum tax, retain estimate						30.0
Scenario, Forecast \| Foreign Tax Authority
Income Taxes
Tax credit, retain estimate						$ 270.0