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Redeemable Noncontrolling Interest (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
shares
vote
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 01, 2021
Apr. 02, 2018
Dec. 31, 2015
USD ($)
Apr. 01, 2015
USD ($)
Redeemable Noncontrolling Interest [Line Items]              
Number of stockholder votes to approve actions | vote 1            
Fair value at date of acquisition             $ 411.5
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 214.5 [1] $ 503.7 [1] $ 483.7     $ 464.9  
Net income attributable to NCI 5.7 5.9 26.2        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest (3.3) 2.3 (3.2)        
Stock Issued During Period, Value, Stock Options Exercised Attributable to Redeemable Noncontrolling Interest 9.4 3.4 0.0        
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests (298.2) 0.0 0.0        
Adjustment to carrying amount of redeemable noncontrolling interest $ (2.8) $ 8.4 $ (4.2)        
ARX Holding Corp.              
Redeemable Noncontrolling Interest [Line Items]              
Number of Shares Put Pursuant to Stockholders' Agreement | shares 204,527            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares 5,483            
Payments to Acquire Interest in Subsidiaries and Affiliates $ 295.9            
Equity interest percentage 86.80% 69.00% 69.20%        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares 16,067            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 23.1            
ARX Holding Corp. | Forecast              
Redeemable Noncontrolling Interest [Line Items]              
Equity interest percentage       100.00%      
Lower Limit              
Redeemable Noncontrolling Interest [Line Items]              
Multiple for determining purchase price of shares 1.0            
Lower Limit | ARX Holding Corp.              
Redeemable Noncontrolling Interest [Line Items]              
Equity interest percentage         80.00%    
Upper Limit              
Redeemable Noncontrolling Interest [Line Items]              
Multiple for determining purchase price of shares 2.0            
Upper Limit | ARX Holding Corp.              
Redeemable Noncontrolling Interest [Line Items]              
Equity interest percentage   80.00%          
[1] See Note 15 – Redeemable Noncontrolling Interest for further discussion.