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Subsequent Events Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]                  
Common Stock, Shares, Issued   45,762,688 45,495,171 45,762,688 45,495,171 45,739,243 45,599,418 45,490,438 45,373,817
Common Stock, Dividends, Per Share, Declared   $ 0.43 $ 0.41 $ 0.43 $ 0.41        
Payments to Acquire Businesses, Gross $ 1,800.0     $ 28.3          
Subsequent Event [Member]                  
Subsequent Event [Line Items]                  
Common Stock, Shares, Issued 5,700,000