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Contingencies Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Roll forward of product warranty accruals In addition to the contingencies above, the Company provides limited warranties on certain of its products. The following is a rollforward of the warranty liability for 2017 and 2016: 
 
2017
2016
Beginning balance, January 1
$
6.9

$
5.4

Expense
2.7

2.4

Payments
(3.8
)
(0.9
)
Ending balance, December 31
$
5.8

$
6.9