Revenue from Contract with Customer Revenue from Contract with Customer (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Integration and Customization of Software Revenue, As A Percentage of Net Sales	1.00%	1.00%	1.00%	1.00%
Contract with Customer, Asset, Credit Loss Expense	$ 9.7	$ 11.5	$ 20.6	$ 26.3
Deferred Revenue, Revenue Recognized			241.4
Deferred revenue	365.3		365.3		$ 437.5
Revenue, Remaining Performance Obligation	$ 2,900.0		$ 2,900.0
Software Net Sales Using Residual Approach, Percent of Net Sales	2.00%	2.00%	2.00%	2.00%

Integration and Customization of Software Revenue, As A Percentage of Net Sales

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Software Net Sales Using Residual Approach, Percent of Net Sales

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Amount of credit loss recognized for write-down of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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