Benefit Plans Benefit Plans - Summary of Benefit Plan (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Document Period End Date		Dec. 31, 2016
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		$ (30.1)		$ 0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		524.2		0.0
Defined Benefit Plan, Curtailments		4.6		0.0
Change in benefit obligation
Benefit obligation at beginning of year		546.4		578.0
Service cost		9.0		3.7	$ 2.9
Interest cost		27.4		23.8	23.0
Actuarial (gain) loss		(33.0)		(29.6)
Plan participant contributions		0.9		0.0
Medicare retiree drug subsidy reimbursements		0.0		0.0
Benefits paid		(35.1)		(29.3)
Benefit obligation at end of year		1,101.4		546.4	578.0
Change in plan assets
Fair value of plan assets at beginning of year		347.9		364.2
Actual return on plan assets		18.1		(0.6)
Employer contributions		8.7		13.6
Plan participant contributions		0.9		0.0
Benefits paid		(35.1)		(29.3)
Fair value of plan assets at end of year		834.6		347.9	364.2
Funded status		(266.8)		(198.5)
Amounts recognized in balance sheets
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent		15.7		0.0
Current liabilities		6.8		3.5
Noncurrent liabilities	[1]	275.7		195.0
Unrecognized net actuarial loss	[2]	(142.3)		(167.5)
Unrecognized prior service cost (benefit)		(0.1)	[2]	(0.1)
Net amount recognized		124.4		30.9
Change in accumulated other comprehensive income
Balance at beginning of year		(167.6)		(176.2)
Prior service credit recognized during the year		0.0		0.0
Net actuarial losses recognized during the year		5.6		6.6
Net actuarial gains (losses) occurring during the year		25.5		2.0
Balance at end of year		(142.4)		(167.6)	(176.2)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		(34.7)		(0.2)
Acquired benefit plans		625.1		0.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax		(4.8)		0.0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Foreign Currency Impact, Before Tax		(1.1)		0.0
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		0.0		0.0
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		0.0		0.0
Defined Benefit Plan, Curtailments		0.0		0.0
Change in benefit obligation
Benefit obligation at beginning of year		12.7		14.5
Service cost		0.0		0.0	0.0
Interest cost		0.5		0.6	0.6
Actuarial (gain) loss		(1.3)		(1.4)
Plan participant contributions		0.0		0.1
Medicare retiree drug subsidy reimbursements		0.0		0.2
Benefits paid		(1.1)		(1.3)
Benefit obligation at end of year		10.8		12.7	14.5
Change in plan assets
Fair value of plan assets at beginning of year		0.0		0.0
Actual return on plan assets		0.0		0.0
Employer contributions		1.1		1.2
Plan participant contributions		0.0		0.1
Benefits paid		(1.1)		(1.3)
Fair value of plan assets at end of year		0.0		0.0	0.0
Funded status		(10.8)		(12.7)
Amounts recognized in balance sheets
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent		0.0		0.0
Current liabilities		1.1		1.2
Noncurrent liabilities	[1]	9.7		11.3
Unrecognized net actuarial loss	[2]	(1.1)		(2.5)
Unrecognized prior service cost (benefit)		0.0		0.1
Net amount recognized		9.7		10.1
Change in accumulated other comprehensive income
Balance at beginning of year		(2.6)		(4.1)
Prior service credit recognized during the year		0.0		(0.2)
Net actuarial losses recognized during the year		0.2		0.3
Net actuarial gains (losses) occurring during the year		1.3		1.4
Balance at end of year		(1.1)		(2.6)	$ (4.1)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		0.0		0.0
Acquired benefit plans		0.0		0.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax		0.0		0.0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Foreign Currency Impact, Before Tax		$ 0.0		$ 0.0

[1] Included in the consolidated balance sheets in pensions and other benefits and other post-retirement benefits are international plans.

[2] Represents amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost.