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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests - Textuals (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 21, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2014
Noncontrolling Interest [Line Items]          
Redeemable noncontrolling interests   $ 273.0   $ 261.7  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests 5.60%        
Purchase of redeemable noncontrolling interests $ 65.0 0.0 $ 65.1    
EHHI [Member]          
Noncontrolling Interest [Line Items]          
Outstanding common stock of Holdings, Fair Value   $ 245.0      
EHHI [Member] | Home Health and Hospice Segment [Member]          
Noncontrolling Interest [Line Items]          
Redeemable noncontrolling interests         $ 64.0
Subsidiary's common stock held by subsidiary 's management, Percent         16.70%