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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Redeemable Noncontrolling Interest [Line Items]      
Balance at beginning of period $ 121.1    
Acquisition of Encompass     $ 14.0
Net income attributable to noncontrolling interests 14.1 $ 13.8 6.6
Distributions (54.2) (49.0) (44.9)
Change in fair value (6.7) (18.2)  
Balance at end of period 138.3 121.1  
Redeemable Noncontrolling Interest [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance at beginning of period 121.1 84.7 13.5
Acquisition of Encompass 0.0 0.0 64.5
Net income attributable to noncontrolling interests 14.1 13.8 6.6
Distributions (7.8) (7.3) (8.5)
Contribution to joint venture 0.0 0.0 4.3
Change in fair value 10.9 29.9 4.3
Balance at end of period $ 138.3 $ 121.1 $ 84.7