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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests - Textuals (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Noncontrolling Interest [Line Items]          
Redeemable noncontrolling interests   $ 261.7 $ 220.9    
Purchase of redeemable noncontrolling interests 5.60%        
Payments to settle the acquisition of Holdings common stock $ 65.0 65.1 $ 0.0 $ 0.0  
EHHI [Member]          
Noncontrolling Interest [Line Items]          
Outstanding common stock of Holdings, Fair Value   $ 223.0      
Home Health and Hospice Segment [Member] | EHHI [Member]          
Noncontrolling Interest [Line Items]          
Redeemable noncontrolling interests         $ 64.0
Subsidiary's common stock held by subsidiary 's management, Percent         16.70%