Basis of Presentation (Impact of ASC 842) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets	$ 270.6
Operating lease liabilities	$ 279.2
Accounting Standards Update 2016-02 (ASC 842)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease ROU assets		$ 274.0
Operating lease liabilities		$ 282.7