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Guarantees (Tables)
 6 Months Ended
Jun. 30, 2018
Standard Product Warranty Disclosure [Abstract]  
Schedule of product warranty liability
Changes in the accrual for product warranties during the six months ended June 30, 2018 and 2017 are set forth below (in millions):
 
2018
2017
BALANCE AT JANUARY 1,
$
14.0

$
13.8

Provision
6.2

6.6

Expenditures/other
(8.4
)
(4.4
)
Acquisitions(a)
44.4

—

BALANCE AT JUNE 30(b),
$
56.2

$
16.0


(a) The acquisition amount disclosed relates to the Aclara acquisition. Refer to Note 3 – Business Acquisitions for additional information.
(b) Refer to Note 7 – Other Accrued Liabilities and Note 8 – Other Non-Current Liabilities for a breakout of short-term and long-term warranties.