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Revenue Recognition and Related Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Jan. 01, 2018
Revenue from Contract with Customer [Abstract]    
Trade receivables, allowance for doubtful accounts $ 47.4 $ 45.8
Contract assets 47.1 44.3
Deferred revenue 829.8 877.9
Revenue recognized 697.5  
Aggregate assets associated with incremental costs to obtain a contract and contract fulfillment costs 73.4 $ 73.0
Amortization related to contract costs $ 24.4