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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Supplemental Financial Information [Abstract]
Operating Lease, Right-of-Use Asset	$ 47.9	$ 53.7	$ 0.0
Supplemental executive retirement plan assets	29.3		27.2
Deferred tax assets	27.8		29.4
Deferred costs	19.1		21.5
Other	18.1		19.7
Other Assets, Net	$ 142.2		$ 97.8

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Assets Noncurrent Other

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Supplemental Financial Information [Abstract]

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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