Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Goodwill activity:
Balance at beginning of year		$ 8,250.1
Goodwill, Purchase Accounting Adjustments		18.5
Foreign currency translation		122.6
Balance at end of year	$ 8,391.2	8,391.2
Canada [Member]
Goodwill activity:
Balance at beginning of year		567.6
Foreign currency translation		20.9
Balance at end of year	588.5	588.5
Europe [Member]
Goodwill activity:
Balance at beginning of year		1,260.5
Foreign currency translation		101.3
Balance at end of year	1,361.8	1,361.8
International [Member]
Goodwill activity:
Balance at beginning of year		6.4
Foreign currency translation		0.4
Balance at end of year	6.8	6.8
UNITED STATES
Goodwill activity:
Balance at beginning of year		6,415.6
Goodwill, Purchase Accounting Adjustments	18.5	18.5
Foreign currency translation		0.0
Balance at end of year	$ 6,434.1	$ 6,434.1