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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Operating Loss Carryforwards [Line Items]          
Estimated net income tax benefit       $ 66.5  
Net estimated income tax benefit associated with the remeasurement       66.5  
Net effect to deferred taxes for U.S. Tax Reform       (65.9)  
Reduction from net income tax benefit as a discrete item $ 0.6   $ 1.2 1.1 $ 0.6
Tax benefit associated with the one-time repatriation tax       0.8  
One-time repatriation tax, included in repatriated earnings from foreign subsidiaries       0.2  
Foreign NOL carryforwards     33.6    
Valuation allowance for foreign NOL carryforward     2.6    
Undistributed earnings of foreign subsidiaries     162.9    
Undistributed earnings of foreign subsidiaries, potential related taxes     5.3    
Other liabilities     17.0 1.9  
Net cash paid for income taxes     64.7 59.4 35.7
Liability for unrecognized tax benefits     21.8 20.1  
Unrecognized tax benefits, income tax penalties and interest accrued     4.3 5.7  
Unrecognized tax benefits, income tax penalties and interest expense (benefit)     (1.0) 1.0 $ 0.6
Other Current Liabilities          
Operating Loss Carryforwards [Line Items]          
Accrued income taxes, current     20.3 19.4  
Other Current Assets          
Operating Loss Carryforwards [Line Items]          
Income taxes receivable     3.3 $ 17.5  
State Tax Authority          
Operating Loss Carryforwards [Line Items]          
State tax net operating loss carryforwards     476.7    
State tax net operating loss carryforwards, valuation allowance     $ 17.1    
Domestic Tax Authority | Internal Revenue Service (IRS)          
Operating Loss Carryforwards [Line Items]          
Income tax examination, penalties and interest expense   $ 0.4