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Basis of Presentation (Details) $ / shares in Units, $ in Millions | May 22, 2019 $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares
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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 | 573,396,959 |  | 571,803,838
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets |  | $ 234.5 |  | $ 0.0
Operating lease liabilities |  | $ 236.2 |  |
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 |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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