CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common shares and paid-in surplus	Retained earnings	AOCI, after tax	Total	Non-controlling interest	Total Equity	Foreign Currency Gain (Loss) Common shares and paid-in surplus	Foreign Currency Gain (Loss) Retained earnings	Foreign Currency Gain (Loss) AOCI, after tax	Foreign Currency Gain (Loss) Total	Foreign Currency Gain (Loss) Non-controlling interest	Foreign Currency Gain (Loss) Total Equity	Pension liability and other accumulated comprehensive items Common shares and paid-in surplus	Pension liability and other accumulated comprehensive items Retained earnings	Pension liability and other accumulated comprehensive items AOCI, after tax	Pension liability and other accumulated comprehensive items Total	Pension liability and other accumulated comprehensive items Non-controlling interest	Pension liability and other accumulated comprehensive items Total Equity
Balances at Dec. 31, 2014		$ 1,034.7	$ 3,010.5	$ (49.5)	$ 3,995.7	$ 542.7	$ 4,538.4
Increase (Decrease) in Shareholders' Equity
Net income	$ 77.0	0.0	84.3	0.0	84.3	(7.3)	77.0
Net change in unrealized gains (losses) from investments in unconsolidated affiliates	28.9	0.0	0.0	28.9	28.9	0.0	28.9
Net change in foreign currency translation	0.0							$ 0.0	$ 0.0	$ (87.8)	$ (87.8)	$ 0.0	$ (87.8)
Other Comprehensive Income (Loss), Net of Tax														$ 0.0	$ 0.0	$ 0.2	$ 0.2	$ 0.0	$ 0.2
Total comprehensive income (loss)	25.6	0.0	84.3	(58.7)	25.6	(7.3)	18.3
Dividends declared on common shares		0.0	(6.0)	0.0	(6.0)	0.0	(6.0)
Dividends to non-controlling interests	0.7	0.0	0.0	0.0	0.0	(7.0)	(7.0)
Repurchases and retirements of common shares		(3.0)	(8.0)	0.0	(11.0)	0.0	(11.0)
Acquisition from non-controlling interests		4.6	0.0	0.0	4.6	(4.6)	0.0
Noncontrolling Interest, Period Increase (Decrease)		0.0	0.0	0.0	0.0	5.2	5.2
Amortization of restricted share awards		2.4	0.0	0.0	2.4	(0.5)	1.9
Balances at Mar. 31, 2015		1,038.7	3,080.8	(108.2)	4,011.3	528.5	4,539.8
Balances at Dec. 31, 2015	4,368.0	978.2	3,084.9	(149.9)	3,913.2	454.8	4,368.0
Increase (Decrease) in Shareholders' Equity
Net income	19.3	0.0	13.0	0.0	13.0	6.3	19.3
Net change in unrealized gains (losses) from investments in unconsolidated affiliates	0.0
Net change in foreign currency translation	0.1							$ 0.0	$ 0.0	$ 37.3	$ 37.3	$ 0.0	$ 37.3
Total comprehensive income (loss)	50.3	0.0	13.0	37.3	50.3	6.3	56.6
Dividends declared on common shares		0.0	(5.4)	0.0	(5.4)	0.0	(5.4)
Dividends to non-controlling interests	0.0	0.0	0.0	0.0	0.0	(6.2)	(6.2)
Repurchases and retirements of common shares		(39.8)	(132.9)	0.0	(172.7)	0.0	(172.7)
Acquisition from non-controlling interests		(2.7)	0.0	0.0	(2.7)	(8.8)	(11.5)
Issuance of shares to non-controlling interests		0.0	0.0	0.0	0.0	0.3	0.3
Noncontrolling Interest, Period Increase (Decrease)		0.0	0.0	0.0	0.0	4.8	4.8
Amortization of restricted share awards		3.2	0.0	0.0	3.2	0.2	3.4
Balances at Mar. 31, 2016	$ 4,237.3	$ 938.9	$ 2,959.6	$ (112.6)	$ 3,785.9	$ 451.4	$ 4,237.3