Debt, Senior Secured Credit Facilities (Details) € in Millions, $ in Millions				1 Months Ended			12 Months Ended
	Aug. 17, 2017 USD ($)	Jun. 30, 2017	May 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014	Jul. 30, 2018 USD ($)	Aug. 17, 2017 EUR (€)	Mar. 04, 2016 USD ($)	Jul. 30, 2013 USD ($)	Jul. 30, 2013 EUR (€)
Amortization and Final Maturity [Abstract]
Principal payment of outstanding borrowings							$ 337.6	$ 2,879.3	$ 26.5
LIBOR [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate							1.00%
Term of variable rate							1 month
Federal Funds Effective Rate [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate							0.50%
Senior Secured Credit Facility [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Aggregate principal amount														$ 2,825.0
Prepayments [Abstract]
Percentage of annual excess cash flow for prepayment of outstanding loan										50.00%
Percentage of annual excess cash flow for prepayment of outstanding loan under restrictive covenants							25.00%
Percentage of the net cash proceeds of all non-ordinary course asset sales for prepayment of outstanding term loan							100.00%
Percentage of net cash proceeds of any incurrence of debt for prepayment of outstanding term loan							100.00%
Certain Covenants and Events of Default [Abstract]
Consolidated Total Debt to Consolidated EBITDA ratio							5.00
Other non-cash collateralized letters of credit maximum amount under restrictive covenant				$ 25.0			$ 25.0
Senior Secured Credit Facility [Member] | Maximum [Member]
Prepayments [Abstract]
Consolidated secured debt to consolidated EBITDA ratio considered for prepayment of outstanding term loan under covenant one							3.50
Certain Covenants and Events of Default [Abstract]
Investments in unrestricted subsidiaries				100.0			$ 100.0
Percentage of consolidated EBITDA							25.00%
Letters of credit under restrictive covenant				80.0			$ 80.0
Provision of non-cash collateralized letters of credit outstanding							$ 50.0
Senior Secured Credit Facility [Member] | Minimum [Member]
Prepayments [Abstract]
Consolidated secured debt to consolidated EBITDA ratio considered for prepayment of outstanding term loan under covenant two							3.00
Certain Covenants and Events of Default [Abstract]
Aggregate amount of non-cash collateralized letters of credit outstanding				120.0			$ 120.0
Senior Secured Credit Facility [Member] | Condition One [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
EBITDA amount							$ 250.0
Consolidated senior secured debt to consolidated EBITDA ratio							5.50
Senior Secured Credit Facility [Member] | Condition Two [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Consolidated senior secured debt to consolidated EBITDA ratio							4.50
Original Dollar Term Loan Facility [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Aggregate principal amount			$ 276.8	35.0			$ 35.0	$ 50.0						1,900.0
Maximum borrowing capacity	$ 1,285.5
Amortization and Final Maturity [Abstract]
Percentage of original principal amount for quarterly installment payment of debt amortization							1.00%
Principal payment of outstanding borrowings				73.3	$ 150.0	$ 100.0
Accrued and unpaid interest			1.5
Write-off of unamortized debt issuance costs			4.3				$ 0.5
Original issue discounts			$ 0.7
Original Dollar Term Loan Facility [Member] | LIBOR [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate	0.00%	1.00%					2.75%
Original Dollar Term Loan Facility [Member] | Base Rate [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate							1.75%
Euro Term Loan Due in 2020 [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Aggregate principal amount | €															€ 400.0
Maximum borrowing capacity | €												€ 615.0
Amortization and Final Maturity [Abstract]
Percentage of original principal amount for quarterly installment payment of debt amortization							1.00%
Euro Term Loan Due in 2020 [Member] | LIBOR [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate	0.00%	1.00%					3.00%
Revolving Credit Facility [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Maximum borrowing capacity													$ 360.0	$ 400.0
Decrease in borrowing capacity													$ 40.0
Expected decrease in borrowing capacity next year											$ 269.9
Letters of credit outstanding				6.5			$ 6.5
Unused availability				263.4			$ 263.4
Interest Rate and Fees [Abstract]
Commitment fee							0.50%
Revolving Credit Facility [Member] | LIBOR [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate	0.00%						2.75%
Revolving Credit Facility [Member] | Base Rate [Member]
Interest Rate and Fees [Abstract]
Basis spread on variable rate							1.75%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Consolidated senior secured debt to consolidated EBITDA ratio							7.50
Revolving Credit Facility [Member] | Condition Three [Member]
Interest Rate and Fees [Abstract]
Commitment fee							0.375%
Revolving Credit Facility [Member] | Condition Three [Member] | Maximum [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Consolidated senior secured debt to consolidated EBITDA ratio							3.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument, Senior Secured Credit Facilities [Abstract]
Maximum borrowing capacity				$ 200.0			$ 200.0