Long-term Debt and Other Financing (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2017	May 31, 2017	Mar. 31, 2017	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Debt Instrument [Line Items]
Capital Lease Obligations	$ 26.3			$ 26.3		$ 26.3		$ 25.2
Unamortized debt discount/premium and debt issuance costs	(58.6)			(58.6)		(58.6)		(53.7)
Total long-term debt	2,098.2			2,098.2		2,098.2		1,816.6
Debt issuance costs						25.0	$ 20.4
Senior Secured Notes Due July 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 380.0			$ 380.0		$ 380.0		$ 380.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%			7.50%		7.50%		7.50%
Debt Instrument, Interest Rate, Effective Percentage	8.30%			8.30%		8.30%		8.30%
Exchangeable Senior Notes Due November 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 150.0			$ 150.0		$ 150.0		$ 150.0
Debt Instrument, Interest Rate, Stated Percentage	5.00%			5.00%		5.00%		5.00%
Debt Instrument, Interest Rate, Effective Percentage	10.80%			10.80%		10.80%		10.80%
Debt Instrument, Convertible, Stock Price Trigger						$ 7.02
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger						130.00%
Debt Instrument, Convertible, Threshold Trading Days						20
Debt Instrument, Convertible, Threshold Consecutive Trading Days						30
Exchangeable notes exchange feature								$ 21.3
Debt Instrument, Convertible, If-converted Value in Excess of Principal						$ 6.0
Senior Notes Due May 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0.0			$ 0.0		$ 0.0		$ 529.8
Debt Instrument, Interest Rate, Stated Percentage	7.625%			7.625%		7.625%		7.625%
Debt Instrument, Repurchased Face Amount			$ 361.3		$ 361.3
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		101.271%	102.125%
Gain (Loss) on Repurchase of Debt Instrument						$ (13.1)
Senior Notes Due October 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 406.2			$ 406.2		$ 406.2		$ 406.2
Debt Instrument, Interest Rate, Stated Percentage	7.625%			7.625%		7.625%		7.625%
Senior Notes Due April 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0.0			$ 0.0		$ 0.0		$ 279.8
Debt Instrument, Interest Rate, Stated Percentage	8.375%			8.375%		8.375%		8.375%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	104.188%			104.67%
Gain (Loss) on Repurchase of Debt Instrument				$ (8.4)
Senior Notes Due October 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 280.0			$ 280.0		$ 280.0		$ 0.0
Debt Instrument, Interest Rate, Stated Percentage	6.375%			6.375%		6.375%
Debt Instrument, Interest Rate, Effective Percentage	7.10%			7.10%		7.10%
Proceeds from Debt, Net of Issuance Costs				$ 275.8
Debt issuance costs				10.6
Senior Notes Due October 2025 [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption, Description						Before October 15, 2020, we may redeem the 2025 Notes at a price equal to par plus a make-whole premium and all accrued and unpaid interest to the date of redemption.
Debt Instrument, Redemption Period, End Date						Oct. 14, 2020
Senior Notes Due October 2025 [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						103.188%
Debt Instrument, Redemption Period, Start Date						Oct. 15, 2020
Debt Instrument, Redemption Period, End Date						Oct. 14, 2021
Senior Notes Due October 2025 [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						101.594%
Debt Instrument, Redemption Period, Start Date						Oct. 15, 2021
Debt Instrument, Redemption Period, End Date						Oct. 14, 2022
Senior Notes Due October 2025 [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						100.00%
Debt Instrument, Redemption Period, Start Date						Oct. 15, 2022
Debt Instrument, Redemption Period, End Date						Oct. 15, 2027
Senior Notes Due March 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 400.0		$ 400.0	$ 400.0	400.0	$ 400.0		0.0
Debt Instrument, Interest Rate, Stated Percentage	7.00%			7.00%		7.00%
Proceeds from Debt, Net of Issuance Costs					$ 394.0
Debt issuance costs						$ 7.5
Senior Notes Due March 2027 [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption, Description						Before March 15, 2022, we may redeem the 2027 Notes at a price equal to par plus a make-whole premium and all accrued and unpaid interest to the date of redemption.
Debt Instrument, Redemption Period, End Date						Mar. 14, 2022
Senior Notes Due March 2027 [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						103.50%
Debt Instrument, Redemption Period, Start Date						Mar. 15, 2022
Debt Instrument, Redemption Period, End Date						Mar. 14, 2023
Senior Notes Due March 2027 [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						102.333%
Debt Instrument, Redemption Period, Start Date						Mar. 15, 2023
Debt Instrument, Redemption Period, End Date						Mar. 14, 2024
Senior Notes Due March 2027 [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						101.167%
Debt Instrument, Redemption Period, Start Date						Mar. 15, 2024
Debt Instrument, Redemption Period, End Date						Mar. 14, 2025
Senior Notes Due March 2027 [Member] | Debt Instrument, Redemption, Period Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage						100.00%
Debt Instrument, Redemption Period, Start Date						Mar. 15, 2025
Debt Instrument, Redemption Period, End Date						Mar. 15, 2027
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 99.3			$ 99.3		$ 99.3		$ 99.3