Basis of Presentation (Details) $ / shares in Units, $ in Millions	May 22, 2019 $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Two-for-one stock split	2
Par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01		$ 0.01
Issued, additional (in shares) | shares	1	573,526,178		571,803,838
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 238.4		$ 0.0
Operating lease liabilities		$ 240.4
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets			$ 227.5
Operating lease liabilities			$ 228.3