Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		$ 33.6	$ 25.7	$ 24.6
Additions Charged to Costs and Expenses		15.6	10.5	6.0
Additions Charged to Other Accounts	[1]	13.0	0.3	1.2
Deductions		(3.2)	(2.9)	(6.1)
Ending balance		59.0	33.6	25.7
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance		355.7	304.5	279.5
Additions Charged to Costs and Expenses		108.8	75.6	49.8
Additions Charged to Other Accounts	[1]	3.4	6.1	17.7
Deductions		(7.2)	(30.5)	(42.5)
Ending balance		$ 460.7	$ 355.7	$ 304.5

[1] In 2016, this amount includes opening balances of businesses acquired in the period.