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Interim Financial Statements (Recent Accounting Pronouncements) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Accounting Standards Update 2016-09 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Income tax deficiencies from share-based awards $ 2.5
Cumulative effect to reduce retained earnings (pre-tax), share-based accounting standard 0.2
Accounting Standards Update 2014-09 [Member] | Minimum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect to increase retained earnings (after-tax), revenue recognition standard 7.0
Accounting Standards Update 2014-09 [Member] | Maximum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect to increase retained earnings (after-tax), revenue recognition standard 10.0
Accounting Standards Update 2016-02 [Member] | Minimum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Expected additional operating lease liabilities 300.0
Accounting Standards Update 2016-02 [Member] | Maximum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Expected additional operating lease liabilities $ 400.0