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Summary of Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Summary of Accounting Policies  
Schedule for Company's allowance for doubtful accounts

 

 

 

 

 

 

 

 

 

 

(in millions)

    

2016

    

2015

    

2014

Balance at January 1

 

$
4.7

 

$
4.8

 

$
3.3

Provision charged to expense

 

 
0.7

 

 
0.4

 

 
2.3

Amounts written off, net of recoveries

 

 
(1.4)

 

 
(0.5)

 

 
(0.8)

Balance at December 31

 

$
4.0

 

$
4.7

 

$
4.8