Financing and Capital Capital (Details) $ / shares in Units, $ in Millions			3 Months Ended	6 Months Ended
	Oct. 01, 2018 $ / shares	Jun. 29, 2018 USD ($) $ / shares shares	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 $ / shares shares
Schedule of Capitalization [Line Items]
Preferred stock issued (in shares)		1,400,000		1,400,000		0
Preferred stock par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01		$ 0.01
Proceeds from issuance of mandatory convertible preferred stock net of $36 million of issuance costs | $				$ 1,338.2	$ 0.0
Payments of Stock Issuance Costs | $				$ 36.0
Preferred Stock
Schedule of Capitalization [Line Items]
Preferred stock issued (in shares)		1,380,000		1,380,000
Preferred Stock, Dividend Rate, Percentage		5.00%
Preferred stock par value (in dollars per share) | $ / shares		$ 0.01		$ 0.01
Preferred Stock, Liquidation Preference Per Share | $ / shares		$ 1,000		$ 1,000
Preferred Stock, Over-Allotment Shares Issued		180,000		180,000
Proceeds from issuance of mandatory convertible preferred stock net of $36 million of issuance costs | $		$ 1,340.0
Payments of Stock Issuance Costs | $		$ 36.0
Convertible Preferred Stock, Shares Issued upon Conversion		10.8554		10.8554
Debt Instrument, Convertible, Threshold Consecutive Trading Days		20
Preferred Stock, Dividend Rate, Per-Dollar-Amount | $ / shares		$ 50.00
Minimum [Member] | Preferred Stock
Schedule of Capitalization [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion		10.8554		10.8554
Maximum [Member] | Preferred Stock
Schedule of Capitalization [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion		13.2979		13.2979
Scenario, Forecast [Member] | Preferred Stock
Schedule of Capitalization [Line Items]
Payments of Stock Issuance Costs | $			$ 1.5
Preferred Stock, Dividends Per Share, Declared | $ / shares	$ 12.78