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Accumulated other comprehensive (loss)
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive (loss)
Accumulated other comprehensive (loss)
The changes in accumulated other comprehensive (loss), by component, for the years ended December 31, 2019, 2018, and 2017 are as follows:
 
For the year ended December 31, 2019
(Millions)
Foreign currency
translation
adjustment

Total

Balance, beginning of year
$
(202.4
)
$
(202.4
)
Other comprehensive (loss)
(35.1
)
(35.1
)
Balance, end of year
$
(237.5
)
$
(237.5
)
 
For the year ended December 31, 2018
(Millions)
Foreign currency
translation
adjustment

Total

Balance, beginning of year
$
(140.5
)
$
(140.5
)
Other comprehensive (loss)
(61.9
)
(61.9
)
Balance, end of year
$
(202.4
)
$
(202.4
)
 
For the year ended December 31, 2017
(Millions)
Foreign currency
translation
adjustment

Total

Balance, beginning of year
$
(212.2
)
$
(212.2
)
Other comprehensive (loss)
71.7

71.7

Balance, end of year
$
(140.5
)
$
(140.5
)