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Deferred acquisition costs
 12 Months Ended
Dec. 31, 2019
Deferred Policy Acquisition Costs Disclosures [Abstract]  
Deferred acquisition costs
Deferred acquisition costs
The following table presents a rollforward of Deferred acquisition costs for the years ended December 31, 2019, 2018, and 2017:
(Millions)
2019

2018

2017

Deferred acquisition costs - balance, beginning of the year
$
141.6

$
120.9

$
84.7

Acquisition costs deferred(1)
221.6

202.6

220.7

Amortization expense
(214.4
)
(180.4
)
(186.7
)
Other, including foreign exchange
(0.6
)
(1.5
)
2.2

Deferred acquisition costs – balance, end of the year
$
148.2

$
141.6

$
120.9

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