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Interim Financial Statements (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 250.0 $ 256.4 $ 0.0
Total Assets 5,692.0 5,640.4 5,384.0
Accrued liabilities 315.1 309.7 283.6
Deferred revenue 124.4 120.4 121.7
Noncurrent operating lease liabilities 235.2 241.0 0.0
Other long-term liabilities 104.6 111.9 122.2
Total Liabilities 4,441.5 4,442.3 4,186.8
Retained earnings 1,212.7 1,163.0 1,162.1
Total Liabilities and Stockholders' Equity $ 5,692.0 5,640.4 $ 5,384.0
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   256.4  
Total Assets   256.4  
Accrued liabilities   26.1  
Deferred revenue   (1.3)  
Noncurrent operating lease liabilities   241.0  
Other long-term liabilities   (10.3)  
Total Liabilities   255.5  
Retained earnings   0.9  
Total Liabilities and Stockholders' Equity   $ 256.4