Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.10.0.1
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]              
Effective income tax rate (as a percent) 29.60% 32.40% 60.70% 29.70%      
FederalCorporateTaxRate 35.00%   35.00%     21.00% 35.00%
BlendedCorporateTaxRate 24.50%   24.50%   24.50%    
ProvisionalDiscreteNetTaxExpense     $ 14.3        
DTLProvisionalCorporateRateReductionNetBenefit     14.9        
ProvisionalTransitionTaxObligation     28.9        
ProvisionalTransitionTaxObligationCurrent     2.3        
Accrued Income Taxes, Noncurrent $ 26.6   $ 26.6