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New Accounting Standards Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Effect of Adoption	[1]		$ (8.1)
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Effect of Adoption		$ 2.0		$ 3.9
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Effect of Adoption			0.2
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement, Effect of Adoption			$ 7.9
[1] Amounts reclassified to retained earnings upon adoption of ASU 2017-12 and ASU 2018-02.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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