Deferred acquisition costs (Tables)

12 Months Ended

Dec. 31, 2018

Deferred acquisition costs

Schedule of deferred acquisition costs

(Millions)	2018		2017		2016
Deferred acquisition costs - balance, beginning of the year	$	120.9	$	84.7	$	74.6
Acquisition costs deferred(1)		202.6		220.7		137.7
Amortization expense		(180.4)		(186.7)		(126.7)
Other, including foreign exchange		(1.5)		2.2		(0.9)
Deferred acquisition costs - balance, end of the year	$	141.6	$	120.9	$	84.7

(1)    2017 amount includes $2.9 from Acquisition of IMG. (See Note 3.)