XML 119 R93.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefit Plans Summary of ARX employee stock option plans (Details) - Employee Stock Option - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 16,067 22,550 24,995 24,995
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 588.15 $ 564.60 $ 526.46 $ 526.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (6,483) (2,445) 0  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 506.26 $ 174.65 $ 0.00  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 13,967 17,950 16,995  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 562.17 $ 517.75 $ 438.77  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 6.2 $ 2.9    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 2,100 4,600 8,000 12,000
Share-based Compensation Arrangement by Share-based Payment Award, Option, Nonvested, Weighted Average Exercise Price $ 760.93 $ 747.45 $ 712.74 $ 677.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (2,500) (3,400) (4,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value $ 736.12 $ 665.79 $ 607.95  
Unrecognized compensation cost related to unvested equity awards $ 0.2 $ 0.7 $ 1.6  
Period of recognition of compensation expense related to unvested equity awards 6 months 10 days 1 year 5 days 1 year 4 months 10 days