Income Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred tax liability not recognized, undistributed earnings of foreign subsidiaries	$ 27.0
Deferred tax assets:
Net operating loss carryforwards, principally in foreign jurisdictions	100.2	$ 102.6
Retirement and other employee benefits	95.1	87.5
Unrealized loss on hedging derivatives	67.8	5.3
Intangible asset	60.2	84.8
Federal tax settlement	14.1	27.8
Other	111.2	102.4
Gross deferred tax assets	448.6	410.4
Valuation allowance	(109.2)	(115.7)
Net deferred tax assets	339.4	294.7
Deferred tax liabilities:
Depreciation and amortization	(1,209.1)	(979.7)
Foreign earnings	(27.9)	(34.0)
Unrealized gain on hedging derivatives	(2.8)	0.0
Other	(15.8)	(15.6)
Deferred tax liabilities	1,255.6	1,029.3
Net deferred tax liability	(916.2)	(734.6)
Unrecognized tax benefits:
Beginning balance	135.8	103.7
Additions for tax positions taken during the current year	2.4	22.3
Additions for tax positions taken during prior years	17.4	18.3
Reductions related to lapsed statutes of limitations	(0.8)	(8.5)
Ending balance	$ 154.8	$ 135.8